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is a significant concern for physicians. Central& q5 g. Q! S. G3 d: k: e. B
precocious puberty (CPP), which is mediated
, y- G x/ ]0 F$ {% q7 U; Q5 dthrough the hypothalamic pituitary gonadal axis, has
E7 [: A6 {8 \4 K8 Z* |& H! w4 ia higher incidence of organic central nervous system9 b) M) U$ y% s: t/ O& C! N6 e2 ]
lesions in boys.1,2 Virilization in boys, as manifested
" c* y8 T3 J7 P. U _by enlargement of the penis, development of pubic
, V1 J( z# |1 o* mhair, and facial acne without enlargement of testi-7 f) i/ j3 n0 V) _
cles, suggests peripheral or pseudopuberty.1-3 We
# ?$ u' ^1 G5 f5 T' _( _; L preport a 16-month-old boy who presented with the
% i/ I2 M' r; P+ @enlargement of the phallus and pubic hair develop-
9 K1 \. v& q% z4 G9 J Gment without testicular enlargement, which was due
* \5 q0 C- i) o3 J" h# kto the unintentional exposure to androgen gel used by# _" P5 I2 S( Z) ^; e7 |' A
the father. The family initially concealed this infor-
* S, y: O1 [0 ]- ]mation, resulting in an extensive work-up for this
* X2 m( {" N4 ]4 A5 y1 N+ F! ^3 mchild. Given the widespread and easy availability of
/ ~$ ~7 M) G" U% v' y% g: Gtestosterone gel and cream, we believe this is proba-$ Z7 `9 @+ Z1 w
bly more common than the rare case report in the
% J5 ^3 O6 w9 N- Hliterature.4
8 u+ g. d. s- U1 APatient Report4 R8 m/ z! k% D! q8 ]
A 16-month-old white child was referred to the O5 d/ Z1 x+ Z! U
endocrine clinic by his pediatrician with the concern+ l; Q1 p- l' z
of early sexual development. His mother noticed$ t+ u4 Q( `2 s9 I
light colored pubic hair development when he was( W! n8 w+ o A$ P8 F( O/ S8 b+ A
From the 1Division of Pediatric Endocrinology, 2University of
$ l% y: |6 w8 M, s3 mSouth Alabama Medical Center, Mobile, Alabama.. y* u! J! {1 |
Address correspondence to: Samar K. Bhowmick, MD, FACE, H3 U, F# D; k! _3 O
Professor of Pediatrics, University of South Alabama, College of
5 s& P0 M6 M5 V0 z) N$ e; Q) OMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
& G1 C: {. X5 {7 i! ~- V7 Ie-mail: [email protected].8 W7 a* ~ Z. j9 ~2 p
about 6 to 7 months old, which progressively became
4 H+ i6 [$ H5 Hdarker. She was also concerned about the enlarge-
$ C' G+ A) j$ m" J; _ment of his penis and frequent erections. The child( C. j- b0 p' }5 L% u, _
was the product of a full-term normal delivery, with- p! b# i; K3 M% U$ p! [
a birth weight of 7 lb 14 oz, and birth length of
5 e! @4 `; h1 M( `0 L# S20 inches. He was breast-fed throughout the first year1 G: Q* C: Y v* G
of life and was still receiving breast milk along with& E0 y0 n! v$ ~* w, T
solid food. He had no hospitalizations or surgery, Q) B% Y& O1 Y j6 s# a+ x" n
and his psychosocial and psychomotor development
' r8 _9 T7 S3 l' Y. o. q8 iwas age appropriate.
6 k1 x$ `1 Q+ eThe family history was remarkable for the father,
* n% w4 @" W" j: X0 s* c- Z" o) ?who was diagnosed with hypothyroidism at age 16,
0 k; P) g# g# g' T) f5 Swhich was treated with thyroxine. The father’s i; o/ x, @( q, E7 {$ N1 m
height was 6 feet, and he went through a somewhat
" F8 E6 F& b3 A/ Mearly puberty and had stopped growing by age 14.
5 P3 z+ Y& p% g# CThe father denied taking any other medication. The5 g$ Z8 G1 N* X
child’s mother was in good health. Her menarche
% N) m# T7 Y" B# Dwas at 11 years of age, and her height was at 5 feet3 E+ y9 K% N6 _ t8 n. T$ s
5 inches. There was no other family history of pre-! A( V w& X* F2 M# r, X/ y
cocious sexual development in the first-degree rela-
. _: w4 w. k+ |2 Utives. There were no siblings.
- ~0 Z0 j+ @' j9 k6 J: ~5 B F% NPhysical Examination& v1 g2 K+ H2 Y1 D0 \' q
The physical examination revealed a very active,
+ \+ K8 H& \- J9 g9 @0 }) dplayful, and healthy boy. The vital signs documented, T( V, S! L5 }; O3 H3 w
a blood pressure of 85/50 mm Hg, his length was
3 j& n9 t/ ?2 ~$ j90 cm (>97th percentile), and his weight was 14.4 kg
: ?: v" ?5 A- p4 u) m' R(also >97th percentile). The observed yearly growth( j& t# ^8 u/ Y
velocity was 30 cm (12 inches). The examination of6 \& }7 |# R. I! P' ], U* \* c' `
the neck revealed no thyroid enlargement.
& j6 `" |6 Q. Y# B% [9 gThe genitourinary examination was remarkable for
# ? w. C9 Z1 Penlargement of the penis, with a stretched length of. f/ |' W7 I9 W/ u
8 cm and a width of 2 cm. The glans penis was very well1 q# q' k a! x$ z6 ]
developed. The pubic hair was Tanner II, mostly around. m7 G& ?$ r% }# ]4 q( s5 ]
540
; E/ d* e+ A7 H1 \at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from2 G3 W( y; Q& w, x# y: q$ E
the base of the phallus and was dark and curled. The
" s8 F4 z! Q$ u# s) c6 @6 I, a% Btesticular volume was prepubertal at 2 mL each.
1 r. ~; B& O, a$ ^) JThe skin was moist and smooth and somewhat8 U1 |: b0 ~( d
oily. No axillary hair was noted. There were no
) V2 e# d/ Y/ X. f1 Aabnormal skin pigmentations or café-au-lait spots.
) |/ S) `# j$ m6 Q0 m8 NNeurologic evaluation showed deep tendon reflex 2+" g2 f6 ^* X/ q! ]8 p
bilateral and symmetrical. There was no suggestion( ^- p7 J( o; N1 |
of papilledema.% t/ J7 Q- y. N! F' u
Laboratory Evaluation
9 y0 |! m- _ CThe bone age was consistent with 28 months by5 _( O* }0 Z, G9 ^% J( A* T
using the standard of Greulich and Pyle at a chrono-" A2 o& W9 v; M6 x1 j/ o( {
logic age of 16 months (advanced).5 Chromosomal! m6 X! j( j, f9 G' u7 ]* R
karyotype was 46XY. The thyroid function test/ S9 C3 h! }, A+ M5 W% h
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
9 F: O: r% z, e* }* d% m+ Elating hormone level was 1.3 µIU/mL (both normal).
" G- z) C/ Q/ `8 r cThe concentrations of serum electrolytes, blood
% N4 ?+ y( L2 E3 uurea nitrogen, creatinine, and calcium all were' A/ p" i! a2 C ]
within normal range for his age. The concentration# ]9 t7 G9 S, ~% S7 N. j: |
of serum 17-hydroxyprogesterone was 16 ng/dL
3 I! q/ A0 G% S; h(normal, 3 to 90 ng/dL), androstenedione was 20
1 k6 h- L+ j% S: hng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
% U) W2 \* t& T) e8 l0 ~+ B8 A0 {1 \3 Cterone was 38 ng/dL (normal, 50 to 760 ng/dL),
: J- {9 E0 F. D% Y1 _5 C9 Odesoxycorticosterone was 4.3 ng/dL (normal, 7 to
- B4 w" t2 Q' M3 d: j6 J; k5 i49ng/dL), 11-desoxycortisol (specific compound S)3 w5 U2 Q- }2 k- P) z1 S9 e
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
4 P# V( s+ j5 n" y% ?tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total3 E2 @" {" W6 i# i" R
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
: _% q! Q4 `) B& ~0 Aand β-human chorionic gonadotropin was less than
$ t% P- b6 j+ O: D8 v5 mIU/mL (normal <5 mIU/mL). Serum follicular
' I1 D1 |: E; h1 [0 Z8 s1 istimulating hormone and leuteinizing hormone; D/ u2 w" M7 V: d: J
concentrations were less than 0.05 mIU/mL
% e' x! v/ w% U* r+ L1 W3 J(prepubertal).
) ]; }# W% c* o% \. n+ J0 oThe parents were notified about the laboratory z$ p- ]& Z5 Z v0 d, G! k* B2 C$ Q
results and were informed that all of the tests were
$ O% }- }7 {/ F8 w6 V) x$ wnormal except the testosterone level was high. The8 Z- m5 m- _) Z! Q5 y. e2 K D) e5 Y
follow-up visit was arranged within a few weeks to" i4 s- d% j2 N# _! B+ I$ P# _
obtain testicular and abdominal sonograms; how-
) N- H. T) A2 z& L( zever, the family did not return for 4 months.5 M5 S _; ?* J4 t
Physical examination at this time revealed that the
: F3 @% ]7 l8 \% ^/ Tchild had grown 2.5 cm in 4 months and had gained
s% z8 m* H3 y2 kg of weight. Physical examination remained
) {" P8 M' X$ j* k+ I- z O' W( s2 Punchanged. Surprisingly, the pubic hair almost com-
$ C7 Y9 p7 F+ H( opletely disappeared except for a few vellous hairs at1 g, C* U7 G& A8 G' u, U/ X, o+ E
the base of the phallus. Testicular volume was still 2
$ a j0 H& l# h ~% J- XmL, and the size of the penis remained unchanged.4 S; p; ]( d; d
The mother also said that the boy was no longer hav-" {3 t0 T7 K S8 b
ing frequent erections." R" y5 o, e1 B2 b) G' Z& b7 ?
Both parents were again questioned about use of: M0 N3 K* V, K/ n/ J& I- {
any ointment/creams that they may have applied to; _' {: T: U- D% C& f% \
the child’s skin. This time the father admitted the
# b3 p: S; g( v5 {1 \ _. K! bTopical Testosterone Exposure / Bhowmick et al 541
3 x, w3 s' h l0 D: E; q) U( cuse of testosterone gel twice daily that he was apply-
* q& Y' `1 `+ q. C: \ing over his own shoulders, chest, and back area for( X5 }& v' {+ n
a year. The father also revealed he was embarrassed
& w6 U' P0 m6 u2 K+ Cto disclose that he was using a testosterone gel pre-
! |; |4 i" \- e+ c9 \3 U& P6 a' Gscribed by his family physician for decreased libido/ d# `% T7 Y9 v) [% o. g
secondary to depression.1 E1 J1 Q p1 m1 s0 Z9 b! B& G
The child slept in the same bed with parents.
$ k! A0 U7 {# m; c% @The father would hug the baby and hold him on his
2 p5 r! v* T+ O$ R$ vchest for a considerable period of time, causing sig-
/ `/ ]% r0 q% N# F! A) K& bnificant bare skin contact between baby and father.* M( h% @0 {9 ~3 K
The father also admitted that after the phone call,
3 R) r' W0 W+ e0 t$ F8 u, R4 l) C+ }when he learned the testosterone level in the baby
! D9 ^' I7 c2 _* T5 awas high, he then read the product information: y# r" D7 e G7 p5 F8 F8 q
packet and concluded that it was most likely the rea-
S, [5 P$ T6 F: E6 bson for the child’s virilization. At that time, they
7 o# z* z& l* o. |decided to put the baby in a separate bed, and the
$ _; }9 {1 R' a# r' T* sfather was not hugging him with bare skin and had
* W# t# b' N' }# L! g5 `been using protective clothing. A repeat testosterone
! U+ |% o+ Q3 k1 e+ y6 htest was ordered, but the family did not go to the
. t8 H: k0 s0 Rlaboratory to obtain the test.
% a) z v2 N8 k6 O0 E; ^2 ~Discussion4 k$ M( k" j0 @( _/ M1 I
Precocious puberty in boys is defined as secondary
`' j0 n/ c' H8 Y' |* Ssexual development before 9 years of age.1,40 u1 y2 Z9 c+ w X8 s3 ]- v
Precocious puberty is termed as central (true) when
; c# F. m% g' r$ T* ~it is caused by the premature activation of hypo-
& L7 a) \# w+ ~$ M& r( `, pthalamic pituitary gonadal axis. CPP is more com-* Y& ?1 y% r, M/ e
mon in girls than in boys.1,3 Most boys with CPP
! ^+ g$ E6 i9 R/ w/ B# z" bmay have a central nervous system lesion that is
; h' |1 d- z; H/ cresponsible for the early activation of the hypothal-( |# p+ R" Z5 k- w; u5 d" w" \7 M$ \
amic pituitary gonadal axis.1-3 Thus, greater empha-2 Y: \, u0 {5 f
sis has been given to neuroradiologic imaging in6 c& m) F- S. b" ]/ e
boys with precocious puberty. In addition to viril-
5 `; R/ @ }. ?4 C# W( d& Mization, the clinical hallmark of CPP is the symmet-
' h1 g7 X( d3 C P' j) U6 Erical testicular growth secondary to stimulation by" |5 R5 q3 l t' L4 O$ b
gonadotropins.1,3
. |1 E% ?/ q/ l* BGonadotropin-independent peripheral preco-# P+ a: N; A4 _5 m' H
cious puberty in boys also results from inappropriate
) `6 @& C, \6 c. u( g1 T$ Wandrogenic stimulation from either endogenous or" Z" F( {) I4 q5 w8 v
exogenous sources, nonpituitary gonadotropin stim-0 s6 M5 U# T* B8 o6 T5 d0 H
ulation, and rare activating mutations.3 Virilizing
+ |" z9 J( j% }% qcongenital adrenal hyperplasia producing excessive# q% g0 V, \/ n2 k! |
adrenal androgens is a common cause of precocious
. I* Z& i) y8 M8 D& x qpuberty in boys.3,4* n M1 K8 k' |% `
The most common form of congenital adrenal. x3 i M/ P( y4 U3 x: \
hyperplasia is the 21-hydroxylase enzyme deficiency.# c& b: j$ b2 f0 l# Y5 A7 x
The 11-β hydroxylase deficiency may also result in) H8 |5 E6 f8 ]% w
excessive adrenal androgen production, and rarely,
$ l4 R7 S- b# [" \% r. k3 Lan adrenal tumor may also cause adrenal androgen
8 e3 l" T$ \- x+ bexcess.1,35 _2 ^0 ^4 ] k1 R o
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
1 O) D1 A0 {& t L( {542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
) I# v! c& _3 y) f3 YA unique entity of male-limited gonadotropin-; d( o. ]1 Z6 p! @$ f
independent precocious puberty, which is also known
( t6 k2 @1 e! `# \& Yas testotoxicosis, may cause precocious puberty at a
3 D/ K3 {" m* k6 D' @- fvery young age. The physical findings in these boys
! u, k+ T& [+ d, Fwith this disorder are full pubertal development,% E- O8 B* E0 R% G. b P
including bilateral testicular growth, similar to boys
) ]- d7 h ?% S, k7 X y% gwith CPP. The gonadotropin levels in this disorder u8 K7 U; |. v
are suppressed to prepubertal levels and do not show
; U3 ]9 y4 T( y6 K y. Z9 s% Fpubertal response of gonadotropin after gonadotropin-! ~5 N9 i. p' H5 {2 g4 `( A: m
releasing hormone stimulation. This is a sex-linked
8 U/ V& [8 q: E& U! ~* zautosomal dominant disorder that affects only/ E+ `1 ?2 ^( k D" B. R
males; therefore, other male members of the family6 s1 z [0 s" v6 p+ U x# |/ ~/ e
may have similar precocious puberty.3
" I: x/ s2 S, g$ j6 \In our patient, physical examination was incon-
, o6 X- X/ B6 ]" O3 x6 L2 B2 y" Lsistent with true precocious puberty since his testi-
6 Z- W$ U. X( hcles were prepubertal in size. However, testotoxicosis
; |# N0 j% x8 k; n4 [3 qwas in the differential diagnosis because his father9 _0 w! e' y6 J2 n+ c7 h8 D3 K$ i
started puberty somewhat early, and occasionally,3 I9 ?1 V! Q( E. a% F' l1 ~9 p3 ?' q
testicular enlargement is not that evident in the
$ p; P i% z% b0 D: Pbeginning of this process.1 In the absence of a neg-
" a) ^" y5 ^* W# a Qative initial history of androgen exposure, our3 Z3 X) o: f1 B0 S
biggest concern was virilizing adrenal hyperplasia,
) A% @( J7 f! r( keither 21-hydroxylase deficiency or 11-β hydroxylase
$ v* {- U; {2 {0 `0 L6 T6 G- l1 s# Xdeficiency. Those diagnoses were excluded by find-
a& C2 [$ y! \ R. Oing the normal level of adrenal steroids.
; f# L( Y5 O( n! ^The diagnosis of exogenous androgens was strongly
0 \ u0 A, W5 {+ A5 Dsuspected in a follow-up visit after 4 months because
7 F$ x7 f2 V: |7 nthe physical examination revealed the complete disap-
1 q7 _0 n7 C+ A; p( D4 Fpearance of pubic hair, normal growth velocity, and
4 f! X3 A- R0 ?1 L0 W" Rdecreased erections. The father admitted using a testos-* x2 s( Q; D! @( M9 }" o; E
terone gel, which he concealed at first visit. He was
+ j) Y6 B; [' J4 Y! ~# p0 [/ C' F2 yusing it rather frequently, twice a day. The Physicians’
4 d9 s, _8 M+ @" M- uDesk Reference, or package insert of this product, gel or0 o9 `# p; |, |# v
cream, cautions about dermal testosterone transfer to. \7 L) Y8 z) Z% I
unprotected females through direct skin exposure.
$ F1 n$ D( G+ ~0 z' B& TSerum testosterone level was found to be 2 times the
7 V1 G5 @' N. _4 i7 o1 Q: Pbaseline value in those females who were exposed to2 a+ e7 w6 m1 g `
even 15 minutes of direct skin contact with their male6 _9 V# |, ~- C. m/ N" \9 d
partners.6 However, when a shirt covered the applica-
& V7 {6 \+ S+ k( Ution site, this testosterone transfer was prevented.
$ x8 o Q2 Y9 NOur patient’s testosterone level was 60 ng/mL,
& Q4 M2 E$ M& y) Y2 A) W5 Owhich was clearly high. Some studies suggest that
, B+ u; Z8 G/ H. N0 J- _dermal conversion of testosterone to dihydrotestos-4 D, _+ A; ?* G
terone, which is a more potent metabolite, is more
& d0 K; i( U) ?1 Sactive in young children exposed to testosterone( @7 c8 L# ~0 Z! n; q
exogenously7; however, we did not measure a dihy-1 |' c$ r) @# T6 k6 ~
drotestosterone level in our patient. In addition to
, u& |" x* ^+ r) f( H) d" w- S" Fvirilization, exposure to exogenous testosterone in
+ p6 o5 \' Q6 qchildren results in an increase in growth velocity and9 r4 L7 ~& p, i8 n
advanced bone age, as seen in our patient.
9 g+ u& }8 c: `/ W$ r" ~The long-term effect of androgen exposure during
: f" z7 F1 t/ c6 O J0 u# yearly childhood on pubertal development and final
7 z# }1 X( O5 d! V/ v' o3 r; X" Badult height are not fully known and always remain
; _( X. ?- q( b9 c- e Fa concern. Children treated with short-term testos-5 m- m" g, ]. G& S5 Z c
terone injection or topical androgen may exhibit some
8 @4 l( K2 \: z Qacceleration of the skeletal maturation; however, after) I7 ]7 g- U9 x2 D$ y9 A- Y% R6 b
cessation of treatment, the rate of bone maturation
4 y6 x. e" V2 U, u: @decelerates and gradually returns to normal.8,90 x# q: i1 Z+ a5 H7 w1 L) a
There are conflicting reports and controversy
# f& Q% c1 B1 J' _$ _ z8 ~- qover the effect of early androgen exposure on adult/ \2 B& a) ^( L @9 j, Z. Y$ Y
penile length.10,11 Some reports suggest subnormal
* q' B! \! z9 Z3 q: q) Z8 v$ ]adult penile length, apparently because of downreg-. @7 f9 a; } _1 }$ ~4 m
ulation of androgen receptor number.10,12 However,
5 ? F4 k$ F+ l, r8 B0 ~Sutherland et al13 did not find a correlation between
) T8 I$ G4 U1 f/ ?; ]4 u' Gchildhood testosterone exposure and reduced adult
) E g: h2 V; h% @. Wpenile length in clinical studies.3 r; T8 V$ B9 Q9 r
Nonetheless, we do not believe our patient is
2 n a: m3 f- Vgoing to experience any of the untoward effects from- Q7 q- j( R3 K" x
testosterone exposure as mentioned earlier because# q" i. u+ U. D" J% w
the exposure was not for a prolonged period of time.6 p. G% r3 j6 Z8 t
Although the bone age was advanced at the time of
5 I1 A H( F! m! R6 ediagnosis, the child had a normal growth velocity at4 o O/ h" V4 B8 z% ]! h; ]
the follow-up visit. It is hoped that his final adult
0 u9 \1 z4 E! u9 s) l8 t' gheight will not be affected.2 W$ a3 T/ y$ ?* {% j, t3 V
Although rarely reported, the widespread avail-
" x3 S8 Y% [, O9 Zability of androgen products in our society may2 C; M. }( R! L! F: V0 {3 I
indeed cause more virilization in male or female) X% \7 ~: A( J5 i1 |
children than one would realize. Exposure to andro-
/ n4 C' V2 b" e% p* f- h: k! x8 jgen products must be considered and specific ques-2 L1 m! ?' a; Y: z2 H
tioning about the use of a testosterone product or, V* e5 J: C4 C. S% G* f `& L
gel should be asked of the family members during% n1 `( W9 |7 F# {/ m
the evaluation of any children who present with vir-3 x: |) L6 H L& h, [ {2 g
ilization or peripheral precocious puberty. The diag-
* v8 w3 A p0 W1 K, E2 P$ G. hnosis can be established by just a few tests and by
" o# v/ J7 }$ G* e+ X/ s! xappropriate history. The inability to obtain such a& C5 X$ q- w+ h
history, or failure to ask the specific questions, may
T& X2 A; [8 d- y7 presult in extensive, unnecessary, and expensive7 ]9 h& X4 l( \9 z
investigation. The primary care physician should be- T4 B; C3 k5 ], A$ w( h
aware of this fact, because most of these children6 d& h& _4 Y. d4 T
may initially present in their practice. The Physicians’/ |' x& n: b; O A/ \* H9 ?4 O' i
Desk Reference and package insert should also put a
2 D& ]4 J& O1 c' ~+ @6 Zwarning about the virilizing effect on a male or
+ u* X/ `( v+ R8 I- r- Pfemale child who might come in contact with some-
* |. ~* v2 C$ l7 ^5 A3 C. wone using any of these products.6 M+ t" l! D2 ~: Y; T
References
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* [6 l- U1 R5 S* m9 [; A4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual
2 f1 G0 c) G& e' Qdevelopment in a two-year-old boy induced by topical
# O( N A" O; a+ [$ Fexposure to testosterone. Pediatrics. 1999;104:e23.
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( g! x" z, f. @Stanford, CA: Stanford University Press; 1959.
& F) U$ ^; R% w' i( ^# W5 c6. Physicians’ Desk Reference. Androgel 1% testosterone,
7 Y. V- S1 {) D6 E) m3 v7 X2 [Unimed Pharmaceutical Inc. Montvale, NJ: Medical
7 j F/ v2 K) v9 e3 q# A% ^Economics Company, Inc; 2004:3239-3241.: O5 \3 q7 X1 K. U1 e4 s
7. Klugo RC, Cerny JC. Response of micropenis to topical
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