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is a significant concern for physicians. Central E9 B: Y) T0 R% `/ c
precocious puberty (CPP), which is mediated, J4 H7 r) v1 c5 q: q, j( D
through the hypothalamic pituitary gonadal axis, has
) f, p" ^* s0 K; S+ t' I- ja higher incidence of organic central nervous system$ l- F! o( W% |$ W0 u' s
lesions in boys.1,2 Virilization in boys, as manifested
1 }' r2 h1 l: s6 s" I& ^9 `by enlargement of the penis, development of pubic
# t! E$ H' j2 A4 B& J5 r, ?hair, and facial acne without enlargement of testi-# r& K' C8 I8 r
cles, suggests peripheral or pseudopuberty.1-3 We
! N- t: `8 [( ?. Q nreport a 16-month-old boy who presented with the9 S7 _0 z3 f0 l# |$ E2 F) R
enlargement of the phallus and pubic hair develop-6 g2 h, s1 F7 g& O: w: K
ment without testicular enlargement, which was due
: D4 o3 e( f' w" Sto the unintentional exposure to androgen gel used by. d' b( `) N8 W! T6 I) t0 E
the father. The family initially concealed this infor-0 D' ^. E" R' W5 ^/ C
mation, resulting in an extensive work-up for this
$ m6 D0 Y9 D+ Q! F/ Y0 k8 Z9 bchild. Given the widespread and easy availability of
, l" m; a" t$ H( stestosterone gel and cream, we believe this is proba-9 V0 R/ C6 z4 T
bly more common than the rare case report in the
* v/ A' g( l8 [) }2 G) m+ x8 o2 U0 `+ Gliterature.4
. ^7 G' @* R+ e( {Patient Report
/ B5 U* A' Y, n8 A& NA 16-month-old white child was referred to the
- P, q, [) _8 k2 L J6 Rendocrine clinic by his pediatrician with the concern H" F" Z9 z6 v" \. r
of early sexual development. His mother noticed
1 _; ], c/ T+ h6 d3 X+ Qlight colored pubic hair development when he was4 Q9 [+ R/ p, {9 t$ }! A |
From the 1Division of Pediatric Endocrinology, 2University of: S& C6 ]5 P. C) n
South Alabama Medical Center, Mobile, Alabama.
! h$ {5 b$ C p0 q3 gAddress correspondence to: Samar K. Bhowmick, MD, FACE,0 m$ S5 Y: A% ~+ s4 W
Professor of Pediatrics, University of South Alabama, College of, `& U' y1 R8 L3 | [4 G
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
& i5 U+ p! v+ D4 d& qe-mail: [email protected].# ~3 |6 S6 ?. f2 Q
about 6 to 7 months old, which progressively became
1 r3 D {' U( [+ V/ ^% q8 F% Tdarker. She was also concerned about the enlarge-: C0 U* x) s: h. t0 Q U& o
ment of his penis and frequent erections. The child" N! r g6 `( g5 P
was the product of a full-term normal delivery, with2 v5 i0 `( a, t( N% r9 P; C) V
a birth weight of 7 lb 14 oz, and birth length of" j! _4 h9 Q" R) L+ ~& C3 c& b
20 inches. He was breast-fed throughout the first year
/ Z& y0 I3 C+ \* D4 O2 \# Lof life and was still receiving breast milk along with
& W: ]/ v: j( C( ]0 Csolid food. He had no hospitalizations or surgery,: j$ m: S% n9 Z, q. s- C+ p6 }, s8 v
and his psychosocial and psychomotor development
; S( k; g4 K6 Jwas age appropriate.+ M" g: d' i! b. t4 D
The family history was remarkable for the father,+ `4 O9 j) f4 F
who was diagnosed with hypothyroidism at age 16,
! o7 D* q. C9 Uwhich was treated with thyroxine. The father’s
4 l y2 }# d0 l2 J2 U$ u' H/ Nheight was 6 feet, and he went through a somewhat
( M2 t& a6 u0 i: Yearly puberty and had stopped growing by age 14." N# _& U1 n9 l
The father denied taking any other medication. The1 D" ^% S( J k. P: F ?8 u+ x
child’s mother was in good health. Her menarche
$ b0 n" }, B$ \$ _was at 11 years of age, and her height was at 5 feet
! u0 y8 f4 {7 u* H3 s5 inches. There was no other family history of pre-- ~" Q! e7 ^1 [, g
cocious sexual development in the first-degree rela-6 K; F E" l0 c- d' z f
tives. There were no siblings.
, h& a( [, e N# o3 @3 qPhysical Examination
8 I+ E. R8 d/ e0 l" U3 s7 v5 ZThe physical examination revealed a very active,& _6 q. B7 U; ^5 K) y+ X
playful, and healthy boy. The vital signs documented' Y# t& C, n5 V0 z
a blood pressure of 85/50 mm Hg, his length was4 ^- c4 n" ]0 F5 P/ S
90 cm (>97th percentile), and his weight was 14.4 kg2 T4 r. a" t4 L
(also >97th percentile). The observed yearly growth7 I) E7 F6 c( Q% j- {
velocity was 30 cm (12 inches). The examination of
9 x- I" F, X: ~6 {* Qthe neck revealed no thyroid enlargement.3 @3 F4 G: e* C9 H9 G
The genitourinary examination was remarkable for
) c. Y6 i. v0 u$ W. M6 x$ l( aenlargement of the penis, with a stretched length of( e7 T8 M6 Q1 @
8 cm and a width of 2 cm. The glans penis was very well8 e, ?- m, G s) s7 w3 W3 \
developed. The pubic hair was Tanner II, mostly around6 T- B1 j3 F9 ~
540) i- N# I3 s) Y
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from$ O X! A$ N2 ^! I
the base of the phallus and was dark and curled. The8 T1 V* f% ?% T) K j' E, A
testicular volume was prepubertal at 2 mL each.
4 |$ T+ `4 i) n! x1 ?The skin was moist and smooth and somewhat
9 z/ L* o" n& s, k' loily. No axillary hair was noted. There were no6 U' H: J3 P2 N0 [" @
abnormal skin pigmentations or café-au-lait spots.
1 ], V) P: d8 f; F- GNeurologic evaluation showed deep tendon reflex 2+& |7 L. l) o. z t- Y
bilateral and symmetrical. There was no suggestion
1 `% @! e9 q: i/ q/ i5 Xof papilledema.' b! @2 H. z4 X; [' o Q' _
Laboratory Evaluation
6 w' v$ t! o6 y$ f+ d: Z# OThe bone age was consistent with 28 months by$ u# y# m7 O1 G2 x6 d5 y/ f6 t, J
using the standard of Greulich and Pyle at a chrono-, q, T/ v* M. [) h8 ?0 Q' N8 P
logic age of 16 months (advanced).5 Chromosomal) ` A: F7 u. n3 a. e/ w
karyotype was 46XY. The thyroid function test" ]$ Y6 k3 E! Q7 v. K
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
+ h$ h+ S8 b+ T6 O+ N# }) m/ }lating hormone level was 1.3 µIU/mL (both normal).' _2 m$ }5 |; z9 {4 U, W; D9 C
The concentrations of serum electrolytes, blood' s% w. W7 J$ e Z g: G
urea nitrogen, creatinine, and calcium all were
, l' J0 T- }2 b8 }0 H5 pwithin normal range for his age. The concentration
/ M6 q8 Z( \+ o7 Bof serum 17-hydroxyprogesterone was 16 ng/dL( B. _8 l# P6 J+ m3 |
(normal, 3 to 90 ng/dL), androstenedione was 20
; A' _' q7 t0 {8 E; F# x& mng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-) Q* ]' a, |+ A" `" F! G
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
$ N; }: V' `# g9 e# {9 m* fdesoxycorticosterone was 4.3 ng/dL (normal, 7 to2 _' o9 e) K' g5 {. ?
49ng/dL), 11-desoxycortisol (specific compound S)- E+ V& J z% S2 Y* x W2 |; V) O
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
! {( {% i/ B) N& Y. |* mtisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
* q+ F' J" N" [; Q( o: ]; {testosterone was 60 ng/dL (normal <3 to 10 ng/dL), C l. U+ `: g" X/ j' U. w! w
and β-human chorionic gonadotropin was less than
( e( P) Z1 t! A' ~2 u0 V' Z( S5 mIU/mL (normal <5 mIU/mL). Serum follicular
' d ]8 h, P+ ?. v; U) ^6 ~) Dstimulating hormone and leuteinizing hormone+ y h1 B* U: Z$ \& y- T
concentrations were less than 0.05 mIU/mL3 ]* I! \* O" n* E
(prepubertal).6 ^* u8 Q4 a. `: P" [$ `2 U
The parents were notified about the laboratory
& E# m2 H. [! R( X Vresults and were informed that all of the tests were7 e5 m" m' D! m, B& g
normal except the testosterone level was high. The2 B; A: `3 z) |: _* [9 c. ^. e- k
follow-up visit was arranged within a few weeks to
5 F# a2 ^/ P! J1 e' V3 Y$ Tobtain testicular and abdominal sonograms; how-4 S, a$ v9 ?4 ~ C! K# G4 r% S
ever, the family did not return for 4 months.) Q! i0 G( k7 ?
Physical examination at this time revealed that the: s; s- y8 \. s. y3 a- O; D
child had grown 2.5 cm in 4 months and had gained; b) m1 T. {+ \& N
2 kg of weight. Physical examination remained
! j0 S6 {, @& q' Dunchanged. Surprisingly, the pubic hair almost com-# o* o b' A3 x9 x" o3 E1 M7 k5 W
pletely disappeared except for a few vellous hairs at" j+ t: v. _# A: `5 o
the base of the phallus. Testicular volume was still 2
8 H9 \5 e' v6 i) @$ qmL, and the size of the penis remained unchanged.
0 ~* L z! I0 p0 h8 d, B! T. h( TThe mother also said that the boy was no longer hav-' \# P( g% u! ]3 E( {0 B
ing frequent erections.
5 B6 u4 M r2 L6 s! JBoth parents were again questioned about use of5 q* R3 t5 A0 u5 Y
any ointment/creams that they may have applied to
# O4 w5 ~( W: [ L6 R1 Othe child’s skin. This time the father admitted the6 d2 L4 ?. V* A1 A- P) s9 M. M
Topical Testosterone Exposure / Bhowmick et al 541+ ?" G3 }8 |1 D# p3 i
use of testosterone gel twice daily that he was apply-
7 d* d6 h8 b# O4 p$ `' Ning over his own shoulders, chest, and back area for" o6 t" E. I% o" E* Q- T
a year. The father also revealed he was embarrassed
0 A6 {4 A# P `) L- _1 ito disclose that he was using a testosterone gel pre-- B$ B$ }4 ]( O: Q
scribed by his family physician for decreased libido
' X; X# \9 E3 T; r- e$ msecondary to depression.
: U @& `9 J7 X- d$ O- wThe child slept in the same bed with parents.6 W8 C) z6 X+ ]- `0 `* v
The father would hug the baby and hold him on his
% h q' X, W* N( V1 L* {" z9 W& zchest for a considerable period of time, causing sig-3 @" f2 @$ Z/ N6 z
nificant bare skin contact between baby and father.5 X: |! o% r! b- z' d
The father also admitted that after the phone call,+ c- S$ m' m- g
when he learned the testosterone level in the baby
2 z( ~0 n" C; m2 p! kwas high, he then read the product information
" E) Q2 ]: F- }/ c+ ~packet and concluded that it was most likely the rea-7 ~& H+ T6 o. j, C+ [2 ^" K
son for the child’s virilization. At that time, they
n0 E$ u2 @* {8 ?* j Tdecided to put the baby in a separate bed, and the& a; n0 h3 {, A# a" I* g
father was not hugging him with bare skin and had5 n+ P, m) x6 o8 u1 O0 N; j# e
been using protective clothing. A repeat testosterone$ q# P; n5 F+ b7 h9 H! y( q
test was ordered, but the family did not go to the
& B% i+ C% F9 ~/ w9 t2 Slaboratory to obtain the test.
$ A: X" H2 ^: Y3 ^9 b% kDiscussion
6 d' k! g% V! `" i2 jPrecocious puberty in boys is defined as secondary# g1 L% A9 k& v- h( x
sexual development before 9 years of age.1,4) x+ u4 U% e( R
Precocious puberty is termed as central (true) when+ Y+ e! _- e: O. n
it is caused by the premature activation of hypo-
4 ^8 x. v$ I! F: k8 e" `( ^9 {/ fthalamic pituitary gonadal axis. CPP is more com-3 T6 [! R1 R" I( L
mon in girls than in boys.1,3 Most boys with CPP* ^( v( w3 L& Y$ [) k$ B
may have a central nervous system lesion that is
" S9 L9 |* Y2 ^4 ?responsible for the early activation of the hypothal-; @! b% Q+ J0 \5 w6 E
amic pituitary gonadal axis.1-3 Thus, greater empha-. m& h9 A! _( o3 P6 \! c! R$ T
sis has been given to neuroradiologic imaging in
' @- \- G, D( ?4 bboys with precocious puberty. In addition to viril-2 Z, S8 l0 B3 D2 p. s) x3 ]7 F( ^
ization, the clinical hallmark of CPP is the symmet-; l' ?- J7 [- w) e, ^3 W
rical testicular growth secondary to stimulation by
/ @& K$ p" u) e% n! \/ Ngonadotropins.1,3
. X2 s" S+ T+ E8 j! ~& O( L4 R" F' ]Gonadotropin-independent peripheral preco-
- E" z+ d$ A9 icious puberty in boys also results from inappropriate
/ }5 N9 I3 c4 k7 X' T/ Eandrogenic stimulation from either endogenous or
% h/ ~! y3 Z- D( A% Dexogenous sources, nonpituitary gonadotropin stim-6 E+ z( L0 B, w
ulation, and rare activating mutations.3 Virilizing6 I% y6 n+ y& _+ L: g3 H8 O
congenital adrenal hyperplasia producing excessive
. L; `, i4 C7 |adrenal androgens is a common cause of precocious, D+ ~. U: D9 {4 W
puberty in boys.3,4
+ V4 c4 I# {, y1 OThe most common form of congenital adrenal( D4 s" D" Z) T/ G
hyperplasia is the 21-hydroxylase enzyme deficiency.9 I J3 A5 ]4 c& E1 d$ ~: O
The 11-β hydroxylase deficiency may also result in$ M6 _" f8 I1 W6 g0 ?
excessive adrenal androgen production, and rarely,, ~, }$ I0 d5 m6 ^" Y/ c5 Y: Z
an adrenal tumor may also cause adrenal androgen8 e) S; P: n0 B6 A# F% o* W' ]$ i
excess.1,3
1 n3 c, W' t+ zat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from I) w8 i+ p2 b, U9 {8 I
542 Clinical Pediatrics / Vol. 46, No. 6, July 20074 F& j# u0 h+ L+ W
A unique entity of male-limited gonadotropin-( W( _( h5 k1 o6 Z0 V
independent precocious puberty, which is also known7 T6 `' A: m2 W$ `; r) s$ a2 ~) u
as testotoxicosis, may cause precocious puberty at a
' Y# A7 N0 s5 \7 F3 zvery young age. The physical findings in these boys
# p8 z e0 H" o9 X! G5 Pwith this disorder are full pubertal development,# L8 h& S4 b0 }9 G4 }( @
including bilateral testicular growth, similar to boys1 c z' q5 _/ m- e
with CPP. The gonadotropin levels in this disorder' A+ V4 b9 |/ J [
are suppressed to prepubertal levels and do not show
* q! P1 W: W* a2 d) Zpubertal response of gonadotropin after gonadotropin-
8 w: ?. x( |( }" N: wreleasing hormone stimulation. This is a sex-linked" I) _. q- ]$ B# O. A$ G
autosomal dominant disorder that affects only" I& d' Q$ Y4 D% g. ?+ t$ ^. b1 {# O$ P
males; therefore, other male members of the family: ^* \" R9 S V# o4 x! ?
may have similar precocious puberty.3
' B! D% O `, y g0 g7 k& ?In our patient, physical examination was incon-* u% r7 s5 u$ @5 x0 k# V- g
sistent with true precocious puberty since his testi-; h' T) e& h( t. d' U
cles were prepubertal in size. However, testotoxicosis8 l# {* O/ q+ @3 r; [- ~
was in the differential diagnosis because his father5 ~2 i( z$ Y# {5 F# \2 U, I, T0 w! s! z
started puberty somewhat early, and occasionally,. M/ G2 G! }. p
testicular enlargement is not that evident in the# C' S' g* Q3 O7 F* T }
beginning of this process.1 In the absence of a neg-, p; y6 `/ I, N7 ~5 Z! P" G
ative initial history of androgen exposure, our
! \% \* F& B& mbiggest concern was virilizing adrenal hyperplasia,. s; ]. Y- c: H$ ^) J9 \
either 21-hydroxylase deficiency or 11-β hydroxylase
2 J" h# Y1 }- \1 K0 L8 Mdeficiency. Those diagnoses were excluded by find-% f2 N0 O2 P! X/ r* `
ing the normal level of adrenal steroids.- X$ p) b. B# o7 g
The diagnosis of exogenous androgens was strongly
# v. U: u0 ~# |- `1 csuspected in a follow-up visit after 4 months because- J9 @5 n& m% c1 E0 P. f
the physical examination revealed the complete disap-" w# ^; ]5 L! d/ R
pearance of pubic hair, normal growth velocity, and
5 A+ V7 B5 W! f& P0 Ddecreased erections. The father admitted using a testos-
, g- S h8 f1 T$ S n2 dterone gel, which he concealed at first visit. He was
% W5 N# m7 l) Jusing it rather frequently, twice a day. The Physicians’
0 |0 w& S* `" S) B6 {Desk Reference, or package insert of this product, gel or
) l- s' H$ s3 Tcream, cautions about dermal testosterone transfer to7 M4 k% d. R' ^6 o" F
unprotected females through direct skin exposure.
! F! {2 d: Y" y1 D3 f3 J. @$ GSerum testosterone level was found to be 2 times the5 s; _: [3 \5 C* F6 I" M
baseline value in those females who were exposed to
# h9 D" N. s1 p. T/ ueven 15 minutes of direct skin contact with their male+ S, s, I$ Z5 y5 g$ ?
partners.6 However, when a shirt covered the applica-/ j6 O2 [6 x- r
tion site, this testosterone transfer was prevented.
! ?. X2 X- P1 w! IOur patient’s testosterone level was 60 ng/mL,6 w5 B8 @: _! _7 J
which was clearly high. Some studies suggest that
1 e$ K% v7 y3 R! Odermal conversion of testosterone to dihydrotestos-
" H o! ~, X. ]% p2 rterone, which is a more potent metabolite, is more# j+ M& Z) S! `
active in young children exposed to testosterone
- e6 B; K6 }/ ?% |4 P3 |$ ]exogenously7; however, we did not measure a dihy-
1 H/ j. x! E' p8 I% udrotestosterone level in our patient. In addition to7 x. K+ Y5 y' J0 I6 E
virilization, exposure to exogenous testosterone in" J4 N. i# ?: c3 h0 T& ]2 m
children results in an increase in growth velocity and- L: h% G5 V4 M: t/ F% K
advanced bone age, as seen in our patient.
" a& s* Z( \% i& b: BThe long-term effect of androgen exposure during
5 U _( ^9 T6 N2 D5 t" I2 V* Xearly childhood on pubertal development and final
/ b7 }/ g9 T: l) J+ c: badult height are not fully known and always remain& L! P# q- \7 k' O+ ?
a concern. Children treated with short-term testos- A7 r5 e# Z% e! f
terone injection or topical androgen may exhibit some, t$ [: r+ F& l5 D: T
acceleration of the skeletal maturation; however, after( e2 b) |8 M" f! ?+ ^
cessation of treatment, the rate of bone maturation
* M% B4 A5 n: ~( D# ?: y. }; idecelerates and gradually returns to normal.8,9
- f& L1 M) c6 RThere are conflicting reports and controversy# U+ e v, H% h( h* D) l9 ~
over the effect of early androgen exposure on adult& o5 r; G( G, f. z* I* E1 u
penile length.10,11 Some reports suggest subnormal
4 e) ?5 X- A% Q2 \adult penile length, apparently because of downreg-- o! x8 c. b( {6 Q9 c
ulation of androgen receptor number.10,12 However,
2 v |) [9 w6 M8 N( WSutherland et al13 did not find a correlation between
/ C' s6 P V+ ?: K8 Xchildhood testosterone exposure and reduced adult
. G$ H% m: s7 S4 I) K% k5 ^& B0 Upenile length in clinical studies.1 I. G0 D9 g# `5 v
Nonetheless, we do not believe our patient is* O% h, e0 X0 E9 p5 P4 b. x; A4 k
going to experience any of the untoward effects from
) [, b- X! r8 R2 H# I$ dtestosterone exposure as mentioned earlier because. |5 i! v" ], b' S% u; L d
the exposure was not for a prolonged period of time.
% D) M5 D, U3 c% R( e1 TAlthough the bone age was advanced at the time of& ^) X5 j6 A% {* R! [
diagnosis, the child had a normal growth velocity at
% S$ D0 B/ N# [2 t7 U Ythe follow-up visit. It is hoped that his final adult- N0 K, I* M: ]5 K+ d7 _
height will not be affected.+ r: a- r8 _9 Z3 [' x% D
Although rarely reported, the widespread avail-3 n8 t! k2 ]3 s+ z
ability of androgen products in our society may
: ?$ Q/ O- H! u" Zindeed cause more virilization in male or female4 T' }; E( p+ V7 F
children than one would realize. Exposure to andro-
$ N! ?$ }1 k7 ]- I3 Fgen products must be considered and specific ques-
4 E8 p. y( g% Stioning about the use of a testosterone product or
/ Q% E8 q* S3 J) G; bgel should be asked of the family members during
! R/ J8 p+ i K( V9 ?- _- Pthe evaluation of any children who present with vir-+ \6 L, c- l% b/ W
ilization or peripheral precocious puberty. The diag-# u6 f+ ?6 c% \/ }; c/ o. |
nosis can be established by just a few tests and by+ ?3 d, h0 K" I- H$ M
appropriate history. The inability to obtain such a
# X+ {" E1 i" y% L6 bhistory, or failure to ask the specific questions, may& D: T! l) h' Z8 P2 s
result in extensive, unnecessary, and expensive
8 T+ v/ E- z; sinvestigation. The primary care physician should be4 M1 [% r3 }4 ~: l
aware of this fact, because most of these children6 ?& n S3 X( y! n0 N
may initially present in their practice. The Physicians’6 A2 Y+ t: ^' U- b
Desk Reference and package insert should also put a5 E5 k# L$ G3 j2 J# g( ^! u' Q5 q3 ^+ \
warning about the virilizing effect on a male or. }* d1 ^ H. c7 J
female child who might come in contact with some-
7 `/ l9 l8 _, s3 ?+ u( a9 Xone using any of these products. p3 ~; B* E- U4 w0 g: m
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2002: 565-628.! V- W. L, W7 T! ]2 V$ H: K
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
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% l8 I# U5 x& {: v1 tareas: organic central precocious puberty. Acta Paediatr.' ]4 V% Q( w o7 Y3 t
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5 b4 t$ I2 N+ X; @9 a& _! R E! e3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.
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Dekker Inc; 2003:211-238.% I( u, {0 g" f* H. c
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exposure to testosterone. Pediatrics. 1999;104:e23.
# S& M# g, @( Y! e/ D, c5. Greulich WW, Pyle SI, eds. Radiographic Atlas of
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& D6 k1 q7 F- g" y) I" p4 Y# \$ ]Stanford, CA: Stanford University Press; 1959.
- U, m8 _( a# Q# A/ y6. Physicians’ Desk Reference. Androgel 1% testosterone,& n( `1 E4 l2 H f
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Economics Company, Inc; 2004:3239-3241.9 g! r8 i$ T! U# ?- q
7. Klugo RC, Cerny JC. Response of micropenis to topical
( P' B R9 V$ y8 Q8 b) z; |# L/ ~, _* btestosterone and gonadotropin. J Urol. 1978;119:% e+ O' C) _7 ?/ T
667-668.; {9 X: v' p" Z# V3 r! I; u
8. Guthrie RD, Smith DW, Graham CB. Testosterone
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