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is a significant concern for physicians. Central
. E4 K1 J7 m4 ?/ A4 ^precocious puberty (CPP), which is mediated- M/ R* z, _/ V' L* e4 x8 _
through the hypothalamic pituitary gonadal axis, has4 n' k' h7 x6 I$ ^6 K1 H
a higher incidence of organic central nervous system
4 y' |) a) e( l4 U# plesions in boys.1,2 Virilization in boys, as manifested1 l' k/ o, L' z$ s( l; a
by enlargement of the penis, development of pubic
4 s+ a, t: C+ ^: X6 q3 t& v- Rhair, and facial acne without enlargement of testi-3 x0 }' Q% Z* I U& {3 ]
cles, suggests peripheral or pseudopuberty.1-3 We
" N! A; `. k9 C7 N( q+ yreport a 16-month-old boy who presented with the
C9 j+ i4 S# s J) f; K) l: T% Benlargement of the phallus and pubic hair develop-8 R W) O0 \! O. \
ment without testicular enlargement, which was due# C; X. d* ~6 T% S
to the unintentional exposure to androgen gel used by
j. [( p3 {# Y# u" Tthe father. The family initially concealed this infor-0 e6 x. n! P% c
mation, resulting in an extensive work-up for this
, j P) |* @8 L' v$ D7 [/ bchild. Given the widespread and easy availability of
3 R, j( z4 O( J4 R! Z- I8 |; D- Ktestosterone gel and cream, we believe this is proba-3 b: V2 |- W6 i, i0 ~) a2 d! Y
bly more common than the rare case report in the% F6 z. }; z+ C' P+ }7 R
literature.4. p7 b4 p6 J# S8 |! T9 C
Patient Report
- I% L) M K( c9 p3 }) o7 D3 YA 16-month-old white child was referred to the
/ o6 h/ q5 I: B8 {- k" Tendocrine clinic by his pediatrician with the concern
- `" l b1 L3 B6 \5 Y4 Z7 Cof early sexual development. His mother noticed
% N( [/ h3 D* L3 Hlight colored pubic hair development when he was' d2 ?. X( k z7 i, @$ D
From the 1Division of Pediatric Endocrinology, 2University of
]! r: j/ C# ^. ^South Alabama Medical Center, Mobile, Alabama.+ a6 }* {/ `/ M# z, G
Address correspondence to: Samar K. Bhowmick, MD, FACE,
# m2 I$ x) g1 a$ A8 F/ x4 [Professor of Pediatrics, University of South Alabama, College of; E' y- m/ ~! R
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;% V: `' }) N0 v- B+ c9 T- z: ~, ^
e-mail: [email protected].% X ]/ B- v, a$ c; R3 Z4 ]
about 6 to 7 months old, which progressively became- c4 f) r5 w; l& w
darker. She was also concerned about the enlarge-
! v6 P# P* C) k& c3 h9 X$ tment of his penis and frequent erections. The child
% f2 J/ v( }0 v( d2 Y( Z+ Gwas the product of a full-term normal delivery, with
" _2 v# f) m7 Ya birth weight of 7 lb 14 oz, and birth length of
! P6 [4 ]2 X l20 inches. He was breast-fed throughout the first year
" B% J$ D4 R r) ?; N7 |of life and was still receiving breast milk along with
0 x$ [* b# Z" B% Ksolid food. He had no hospitalizations or surgery,; U% n3 v5 ~8 r6 ^
and his psychosocial and psychomotor development
8 S3 y. b/ s. M: Z. x, uwas age appropriate.
3 E) }" M) ` t1 I, x# U# \The family history was remarkable for the father,
c" V1 c- n9 swho was diagnosed with hypothyroidism at age 16,, G# v1 p U3 `6 ]) G) r, M9 q. ~
which was treated with thyroxine. The father’s
' E2 l' z3 q5 I* ?3 Vheight was 6 feet, and he went through a somewhat
( p5 e9 D/ |4 G! Oearly puberty and had stopped growing by age 14., e& ^3 ~$ M% }8 k
The father denied taking any other medication. The* y* ]+ z8 ]" R. _+ j
child’s mother was in good health. Her menarche7 o+ m; u* k/ J. A
was at 11 years of age, and her height was at 5 feet
7 K" D$ o: x/ w4 p4 `3 _3 z) l$ a% U, N5 inches. There was no other family history of pre-
( R( r) O8 t6 h- U# Hcocious sexual development in the first-degree rela-5 a4 O/ Y8 m3 P& ?( `
tives. There were no siblings.
# S# O* y, ^9 \Physical Examination
+ J7 h" K% {1 u0 \The physical examination revealed a very active,
7 x+ C5 K3 ]. P3 Z9 fplayful, and healthy boy. The vital signs documented
' o3 F( x3 D/ U& ^a blood pressure of 85/50 mm Hg, his length was
X7 H- w/ d$ g6 x2 ?% t+ G) x90 cm (>97th percentile), and his weight was 14.4 kg" W& o) l0 ^$ q( |* K7 l' P
(also >97th percentile). The observed yearly growth& C+ Y! b3 v% B$ s8 _2 x
velocity was 30 cm (12 inches). The examination of, S/ b; v; _# M4 i C
the neck revealed no thyroid enlargement.- w+ \4 e6 V' Q, @2 |
The genitourinary examination was remarkable for: S% [! V4 f0 Y2 u
enlargement of the penis, with a stretched length of
! B& n% M# P$ W& g) E0 D8 cm and a width of 2 cm. The glans penis was very well
" f4 v4 d( a. y3 N' q7 ?, Y9 bdeveloped. The pubic hair was Tanner II, mostly around
: t* f0 f5 h* ~( D" T: ]540: X$ Y. k& l/ s/ \4 g
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
; a9 d4 N. d1 I% gthe base of the phallus and was dark and curled. The
1 K$ W/ V) `. r1 P' Xtesticular volume was prepubertal at 2 mL each.
7 t4 V) F5 m+ p4 I0 y- CThe skin was moist and smooth and somewhat
5 R" E, n9 g0 ]+ |6 B/ _* }: {0 M4 yoily. No axillary hair was noted. There were no
( }# d. q# v0 pabnormal skin pigmentations or café-au-lait spots.
. e& Z7 u7 v. |2 SNeurologic evaluation showed deep tendon reflex 2+$ X- L7 T( W% U
bilateral and symmetrical. There was no suggestion
a, }- ?7 G Pof papilledema.
& z0 E0 I" @ f5 @& ^Laboratory Evaluation
$ m7 `8 Z8 ^1 z( l. m: F$ iThe bone age was consistent with 28 months by
& ?4 Z- Z/ o6 `- {using the standard of Greulich and Pyle at a chrono-3 V! K9 ?- T( s( \: L- r0 A6 L' p' o
logic age of 16 months (advanced).5 Chromosomal
1 l7 I+ Q: l" {$ Xkaryotype was 46XY. The thyroid function test! C7 ?. ]; N9 i
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
4 x" j& g$ h; M+ \+ y% ]6 ?+ Dlating hormone level was 1.3 µIU/mL (both normal).
7 g s- P0 v" F9 BThe concentrations of serum electrolytes, blood/ ~+ M- B4 |5 p- {
urea nitrogen, creatinine, and calcium all were
; J8 j$ a. @7 w5 c; ~within normal range for his age. The concentration* z9 s7 d; U2 h( c, ]! U j
of serum 17-hydroxyprogesterone was 16 ng/dL; z/ v' k' K) J8 K3 R: ~
(normal, 3 to 90 ng/dL), androstenedione was 208 _0 m6 s4 V" x0 G/ |
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-; s6 q# o9 c" ^1 G5 \* S- h
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
+ h0 E- J A% M* e: `desoxycorticosterone was 4.3 ng/dL (normal, 7 to
- U7 f, Z6 L$ p+ T; T49ng/dL), 11-desoxycortisol (specific compound S)/ x. n( ^/ q% u7 m& T
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
/ J# B! A* t( |9 Atisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total* l5 ~& V% ~- I: ~
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
( A# t& u6 S, B! Q* xand β-human chorionic gonadotropin was less than) ?% B( f/ p0 O9 | Y, u$ }
5 mIU/mL (normal <5 mIU/mL). Serum follicular
" P+ _/ E( F. R3 @stimulating hormone and leuteinizing hormone6 j: A+ w" V- t
concentrations were less than 0.05 mIU/mL, ?# h: ]( p/ C. m! x& I+ [& u' }
(prepubertal).
$ W/ K1 ]3 t5 q' c6 U0 U/ z/ oThe parents were notified about the laboratory1 T& C& b) t/ ?) {# \) L( t
results and were informed that all of the tests were
' V; s& ]) |+ @/ f8 Q( g9 hnormal except the testosterone level was high. The
/ n# z0 z8 Z, Wfollow-up visit was arranged within a few weeks to& C* d, j6 _' {( ~0 X2 ]
obtain testicular and abdominal sonograms; how-
# S6 x4 t/ X0 B: ?0 d7 R3 w Y! Oever, the family did not return for 4 months.
7 |" a* g: s* w! ^: MPhysical examination at this time revealed that the( v5 M0 x9 k( E6 a8 s! S7 v) d
child had grown 2.5 cm in 4 months and had gained: f6 c. k! F( j( g+ @( D
2 kg of weight. Physical examination remained0 K4 T/ |& X1 m9 l8 Y" F4 V
unchanged. Surprisingly, the pubic hair almost com-3 W. v' {7 C! c9 n: k+ y
pletely disappeared except for a few vellous hairs at
+ d8 u2 F2 i5 c/ Ythe base of the phallus. Testicular volume was still 2
1 f: i) @. V4 N2 k/ f1 ImL, and the size of the penis remained unchanged.5 I. p- T+ I, X8 `/ ^* r
The mother also said that the boy was no longer hav-
- K+ }; \. D! _+ M+ Zing frequent erections.
1 m- J: i" }/ H% @; `Both parents were again questioned about use of- ~: }% N' o4 y
any ointment/creams that they may have applied to; Z$ t. P5 [/ C% l' \% g2 p8 z% p2 ]
the child’s skin. This time the father admitted the
' q9 w, T6 J/ B* NTopical Testosterone Exposure / Bhowmick et al 541
# K& ?& P R* S& Y, fuse of testosterone gel twice daily that he was apply-: c, n: _& S: j* Q h" l# N- d1 I
ing over his own shoulders, chest, and back area for
( Z1 N3 H6 g2 @: M3 z: j: ta year. The father also revealed he was embarrassed* f4 W6 n& M' x$ \: l A
to disclose that he was using a testosterone gel pre-
3 b8 f$ | U: Ascribed by his family physician for decreased libido. K8 M: W8 ~- z" F7 n, V
secondary to depression.
, @9 ^1 q/ j; MThe child slept in the same bed with parents.
, d6 |7 c, u' w+ j* UThe father would hug the baby and hold him on his: F* d3 f5 f/ C3 R4 W! u
chest for a considerable period of time, causing sig-
/ S ]/ Z) s2 n, Y* Jnificant bare skin contact between baby and father.$ G _8 V+ w3 l
The father also admitted that after the phone call,
, F; T; d* H0 T2 H. U# Awhen he learned the testosterone level in the baby4 v) u2 l9 V+ p$ E4 Z6 S) X6 Z; @+ e m
was high, he then read the product information
/ ?' ?7 Q; `7 i9 L8 Vpacket and concluded that it was most likely the rea-2 Q3 @7 B5 R& h j9 u
son for the child’s virilization. At that time, they
" D8 I/ b2 C7 D& u6 H0 f1 r! h. Gdecided to put the baby in a separate bed, and the
. W$ F! R8 x; @( A. L* Vfather was not hugging him with bare skin and had
8 [! O- m$ ^ Q& @; a7 @been using protective clothing. A repeat testosterone! l8 [- ~/ t5 d# I8 |
test was ordered, but the family did not go to the
7 u/ i8 \2 b/ Y' o% Hlaboratory to obtain the test.3 s$ I1 P- M. k2 O8 L1 c( \8 R
Discussion
k4 P9 t5 ?0 b9 e8 W( K* aPrecocious puberty in boys is defined as secondary
9 Z7 r% p( G5 Ssexual development before 9 years of age.1,4" ^9 A# q! J9 y1 u8 J
Precocious puberty is termed as central (true) when9 N- Y8 N4 V3 v5 e$ W8 B
it is caused by the premature activation of hypo-- @2 |$ d6 `: ~! e) i1 ` I9 t9 v
thalamic pituitary gonadal axis. CPP is more com- y& Q, `7 `) ?) b/ b
mon in girls than in boys.1,3 Most boys with CPP
# Y* f9 Y2 Q9 z7 L& r3 v) }may have a central nervous system lesion that is
2 ?' ]' E; W, M$ n6 f; wresponsible for the early activation of the hypothal-8 S6 i' A" F, L6 {/ Q% _
amic pituitary gonadal axis.1-3 Thus, greater empha-6 o; h( s4 o; r3 K% I% l$ a: {
sis has been given to neuroradiologic imaging in: Y" [4 B" m; }; _* b
boys with precocious puberty. In addition to viril-
! l8 N7 ~- r z, J- yization, the clinical hallmark of CPP is the symmet-
. T9 `# U! w6 P0 H) T( [rical testicular growth secondary to stimulation by
, Y, d; O0 q. q" `. g" v* ?gonadotropins.1,3
0 a3 V7 Q5 s# |* P* l) \$ kGonadotropin-independent peripheral preco-
4 w7 z1 j5 n+ k/ u" Y. ?$ Bcious puberty in boys also results from inappropriate
) M- r0 \1 t Q8 E4 E# Vandrogenic stimulation from either endogenous or: T9 X6 _4 O1 y0 K1 A' N) x
exogenous sources, nonpituitary gonadotropin stim-/ P: e' j4 c1 w
ulation, and rare activating mutations.3 Virilizing0 n/ d" B! ]2 F" \4 L$ P
congenital adrenal hyperplasia producing excessive
5 c X( G9 F1 C9 {8 r7 I: |adrenal androgens is a common cause of precocious
6 } v, i6 a& D) ypuberty in boys.3,44 V; u/ {) p: H
The most common form of congenital adrenal
. O% n, @# `: G/ l5 B4 M+ ?hyperplasia is the 21-hydroxylase enzyme deficiency.
7 p4 Z. ~& d' S7 p' @3 P x* Q+ HThe 11-β hydroxylase deficiency may also result in
2 |! E) M {" u( W+ W1 A0 i- a' y; \& ]excessive adrenal androgen production, and rarely,
2 o9 |8 o; [ d8 t3 i) }an adrenal tumor may also cause adrenal androgen
+ f. a$ [. }. ]' h* x" m0 {) t5 @excess.1,3; w" P4 z' ?6 v/ w& A
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from6 j" }4 m& M: l2 ?; K4 o
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007. }1 v4 T! l/ r2 I( i
A unique entity of male-limited gonadotropin-
% K4 T* n3 p2 E- d/ n `independent precocious puberty, which is also known
4 u$ s! g! R* K" A# q: f# Tas testotoxicosis, may cause precocious puberty at a' D* V# H# O0 A/ c5 o: p W6 ~
very young age. The physical findings in these boys- }5 X: ^2 [, @/ S! c+ A
with this disorder are full pubertal development,- D/ V- C/ @% C4 O# F* F \
including bilateral testicular growth, similar to boys
j7 z2 Z2 T9 bwith CPP. The gonadotropin levels in this disorder
1 B& E- R. O- s5 }& A( {: iare suppressed to prepubertal levels and do not show
. L' w* ]8 [" L1 k# Q2 S; ^pubertal response of gonadotropin after gonadotropin-" V9 V K; |+ U4 Q
releasing hormone stimulation. This is a sex-linked
0 T/ K) J9 f& O1 }) i+ L1 Xautosomal dominant disorder that affects only9 ?5 s+ k- d3 K9 a6 M/ n7 S
males; therefore, other male members of the family
0 }+ v" g( y% ^- m) L% {* Rmay have similar precocious puberty.3+ |4 N6 `2 ]# i1 {2 |
In our patient, physical examination was incon-
* {% V9 F, Y' v& P1 Esistent with true precocious puberty since his testi-
% J+ T8 h; s) i5 Pcles were prepubertal in size. However, testotoxicosis; U5 N0 r0 Y, e
was in the differential diagnosis because his father
0 F* C4 Y2 V* F- S0 b o/ rstarted puberty somewhat early, and occasionally,# {* u; a0 C$ g: E6 A- k3 c
testicular enlargement is not that evident in the
/ D0 e! X( x* f, lbeginning of this process.1 In the absence of a neg- Z( f! ? w0 b' F
ative initial history of androgen exposure, our
* k2 V$ L2 U" G* Q5 @biggest concern was virilizing adrenal hyperplasia,* R+ g V" n0 n; N
either 21-hydroxylase deficiency or 11-β hydroxylase- D# X7 h( Q. B8 J3 _+ d% C
deficiency. Those diagnoses were excluded by find-
2 l {4 v. b8 L9 g, `1 hing the normal level of adrenal steroids.7 G; f. B- ^ K. c
The diagnosis of exogenous androgens was strongly6 @& ]7 Q0 J$ s7 j+ {
suspected in a follow-up visit after 4 months because% P4 f; t1 S; l. V
the physical examination revealed the complete disap-+ Y$ d' h: @/ f% H
pearance of pubic hair, normal growth velocity, and8 E' U, [. d9 ^6 P3 S4 m) L' o
decreased erections. The father admitted using a testos-
! M3 Q; l7 l! C6 fterone gel, which he concealed at first visit. He was. m+ y$ A" L, e/ y) D
using it rather frequently, twice a day. The Physicians’: T& x9 [: X* z/ }1 \9 |/ \
Desk Reference, or package insert of this product, gel or( e2 w( S: q& v" W* p
cream, cautions about dermal testosterone transfer to
7 S5 `) B: D$ m5 B$ ?* {unprotected females through direct skin exposure." R8 E: U, y5 S4 {/ l
Serum testosterone level was found to be 2 times the9 O+ e5 K" R; U. W7 s' c. [% G
baseline value in those females who were exposed to
! f; j) ]; p' [8 F% B' R: ~even 15 minutes of direct skin contact with their male
! v" ^7 \6 k) T! _5 R. Lpartners.6 However, when a shirt covered the applica-
6 N% v& f, O& Y _tion site, this testosterone transfer was prevented.
, F2 x9 Z4 O) x8 S: LOur patient’s testosterone level was 60 ng/mL,
5 j% b* A; ]6 ?$ l( ^0 }; Qwhich was clearly high. Some studies suggest that
% U0 a& q- @" X+ m! E odermal conversion of testosterone to dihydrotestos-
0 @4 x" P0 M; x; _: y, v9 B& yterone, which is a more potent metabolite, is more
% X6 W- q7 ?/ ~) t3 ~7 xactive in young children exposed to testosterone
5 [) f" N% `) v7 Y5 pexogenously7; however, we did not measure a dihy-& Q$ Q4 H) f& U2 f
drotestosterone level in our patient. In addition to
t( y" A. }& ^# x& {- u% I6 E6 ?virilization, exposure to exogenous testosterone in
2 K7 Q3 t _6 Y5 m8 Q; k7 fchildren results in an increase in growth velocity and
4 q1 y9 k' Z( R& v2 i' @+ ^6 Zadvanced bone age, as seen in our patient.
% h7 \# E/ n" ^0 yThe long-term effect of androgen exposure during
- a2 g. Q( A' ?: a* i# l, Aearly childhood on pubertal development and final; f) k6 H; e- _9 F& f3 J
adult height are not fully known and always remain+ T' ^, v' w/ a9 T" W* E) I
a concern. Children treated with short-term testos-) h' q2 T5 D1 g6 x4 z
terone injection or topical androgen may exhibit some" V' R' d5 c* [! v( `4 b6 P% e
acceleration of the skeletal maturation; however, after
3 w6 D8 ]0 p* {( Qcessation of treatment, the rate of bone maturation
5 {$ I" q2 R% N' @. N/ }2 y! [decelerates and gradually returns to normal.8,9
M& o) G0 Z" W" I- K) T1 v& f$ uThere are conflicting reports and controversy
& p5 B6 \; a- _8 D' g- C' wover the effect of early androgen exposure on adult
5 B+ G; V3 `; \+ D6 N2 Spenile length.10,11 Some reports suggest subnormal: m1 R* O' u+ \$ J% ]8 o0 F, K
adult penile length, apparently because of downreg-
6 Y& f2 H+ `+ m" culation of androgen receptor number.10,12 However,8 ^3 I) p3 n3 \) G
Sutherland et al13 did not find a correlation between
! j& R/ H0 O. Q- b% Rchildhood testosterone exposure and reduced adult5 |8 F0 M& a# R/ ^
penile length in clinical studies.
5 a& X- D& |: [7 h1 b- J- JNonetheless, we do not believe our patient is# {! L" f% `- `- ?
going to experience any of the untoward effects from" [7 c( o7 M" o1 K
testosterone exposure as mentioned earlier because
% z% U7 A9 N. J1 [the exposure was not for a prolonged period of time.- Q& `$ I" r. t+ Y
Although the bone age was advanced at the time of$ g* U' u- H- e+ o; y. I
diagnosis, the child had a normal growth velocity at3 d( h! x. `9 b9 g I
the follow-up visit. It is hoped that his final adult7 l) x3 b; ?1 m; n8 }
height will not be affected.
7 o; q6 ^2 t! D; iAlthough rarely reported, the widespread avail-
+ [& c1 u. [8 {" ^! F e! }0 f2 {3 {ability of androgen products in our society may% K3 X# {, ` ~. r& W
indeed cause more virilization in male or female
+ Y4 h' f& }0 H y5 \children than one would realize. Exposure to andro-
X5 e/ d/ p: H2 X, u. E+ H- ngen products must be considered and specific ques-% D+ @6 Z& }5 r1 k! V* k; R
tioning about the use of a testosterone product or2 g1 T1 x0 V0 V$ o# D- J+ P
gel should be asked of the family members during
% O6 ]. j/ E! V% s" c* fthe evaluation of any children who present with vir-, R6 q. ~' P+ S. k D
ilization or peripheral precocious puberty. The diag-
* N. \ o5 t/ v( j' Onosis can be established by just a few tests and by+ ?* E0 _8 d8 _- S
appropriate history. The inability to obtain such a+ f: r, v) n+ i+ [+ E
history, or failure to ask the specific questions, may
6 i1 j* b' h, q8 @' I" Iresult in extensive, unnecessary, and expensive
- c' j& Z" ^6 G: B0 i5 Q3 xinvestigation. The primary care physician should be- x: g: W! o- _, R! f8 k% q" A
aware of this fact, because most of these children% x" ~, Z. d4 W' F( }2 \
may initially present in their practice. The Physicians’
: q |+ B7 y& [, V: ZDesk Reference and package insert should also put a3 e/ n4 I y: W/ p5 c3 H
warning about the virilizing effect on a male or' W% Q' I$ y0 j4 g m* i, }
female child who might come in contact with some-7 @8 X* V: p$ u" Y4 y* Q5 V
one using any of these products.7 J/ S, R) _ a- R8 n; _; H
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2002: 565-628.
G% V; Y$ z' _2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious4 R. I$ @ o N8 S
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exposure to testosterone. Pediatrics. 1999;104:e23.
+ `4 w: m& C+ z u& W* t; p5. Greulich WW, Pyle SI, eds. Radiographic Atlas of( G* g) C( T3 g- o" D/ T5 C5 e
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3 a. |4 Z# C) ^$ `: x7 J" F6. Physicians’ Desk Reference. Androgel 1% testosterone,9 ]( l, ~* [! Z \; V* l$ L
Unimed Pharmaceutical Inc. Montvale, NJ: Medical! Z$ z' g3 {" [
Economics Company, Inc; 2004:3239-3241.
$ E2 _& s; w2 J/ n1 x9 d/ ]7. Klugo RC, Cerny JC. Response of micropenis to topical
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