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is a significant concern for physicians. Central! l+ z# V( u! I6 Q; p# k
precocious puberty (CPP), which is mediated+ G3 x4 O* @( g6 L/ l
through the hypothalamic pituitary gonadal axis, has" ]+ n+ A9 s' @' K! h* S. q
a higher incidence of organic central nervous system
& J# J# @2 Y. Q( F7 \lesions in boys.1,2 Virilization in boys, as manifested" n2 {% G2 t( d+ p- i
by enlargement of the penis, development of pubic7 ?: C j5 i V% T4 W# {/ u
hair, and facial acne without enlargement of testi-
; X. ?& X6 r" I& L2 p$ i# z/ Bcles, suggests peripheral or pseudopuberty.1-3 We5 i s# E& ~; `% j, q% @: ~5 I
report a 16-month-old boy who presented with the
. N% h0 j; ]2 q2 M* \: Jenlargement of the phallus and pubic hair develop-
6 A$ F3 t; f) k, C* ]ment without testicular enlargement, which was due# T! n$ ?8 u1 S# ]+ o: h
to the unintentional exposure to androgen gel used by
; `$ x t/ q+ |. H3 sthe father. The family initially concealed this infor-
# L3 [8 d" G$ g! q- ^# U# ?mation, resulting in an extensive work-up for this
. \' Y( D, F0 H7 W' w: T: achild. Given the widespread and easy availability of
6 U* C# @+ Q1 |testosterone gel and cream, we believe this is proba-$ ~# x- ]2 w* |1 c# E
bly more common than the rare case report in the
7 K6 u, I+ |! H n* @2 t' A* Uliterature.4
; D9 a/ j! v: J8 c9 v* fPatient Report: F8 o2 V: G$ h# _
A 16-month-old white child was referred to the
) [6 l3 K: j% o3 H8 b$ jendocrine clinic by his pediatrician with the concern. w5 Y4 | ^/ F7 C
of early sexual development. His mother noticed! z# i2 w( K3 S3 e. Z9 o7 `0 n
light colored pubic hair development when he was
" b, H) Q" {( m+ `! i: z/ R0 W% vFrom the 1Division of Pediatric Endocrinology, 2University of
! k* Q/ B9 f6 q7 [, p' ESouth Alabama Medical Center, Mobile, Alabama.
) _! L( d0 Q0 u6 x |3 M+ dAddress correspondence to: Samar K. Bhowmick, MD, FACE,
, W2 I+ I# |+ x' ]: U- mProfessor of Pediatrics, University of South Alabama, College of
* D. k1 }- m" a( J0 LMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;) G1 \' D0 F5 J0 Z7 B$ T
e-mail: [email protected].
9 Z. m# L& F i* yabout 6 to 7 months old, which progressively became# m; u( [2 U [! k% Q, b
darker. She was also concerned about the enlarge-" r4 v/ r" s0 Y6 h) L8 p: D
ment of his penis and frequent erections. The child% Y" M5 \2 {! K! b: A2 r
was the product of a full-term normal delivery, with
: M" r: p; e' D5 H# \a birth weight of 7 lb 14 oz, and birth length of8 d3 d9 u+ c; g. N, P' M7 e0 q: [& P7 r
20 inches. He was breast-fed throughout the first year
5 p6 b) R. a* b& b0 o2 r5 t8 aof life and was still receiving breast milk along with
" i" ]% U- W) J9 x. dsolid food. He had no hospitalizations or surgery,9 O! v: `- g$ @8 Z6 l. L
and his psychosocial and psychomotor development
^- x. @ s6 I' wwas age appropriate.
% ]0 N" D. k2 Z1 R/ XThe family history was remarkable for the father,- c1 S5 a+ x ]' ?% F. c( A
who was diagnosed with hypothyroidism at age 16,; |9 g2 ?% Q4 g! g' X% i
which was treated with thyroxine. The father’s
; o( _8 O. T' ?/ _0 t2 o2 vheight was 6 feet, and he went through a somewhat. @: s; R; e. r& G. \5 Z& ^$ Q
early puberty and had stopped growing by age 14.
) U8 A$ w6 U& ?- FThe father denied taking any other medication. The" e" f, C7 }! D4 G4 t( i, k
child’s mother was in good health. Her menarche6 h5 _) t4 E6 e5 I
was at 11 years of age, and her height was at 5 feet4 |! o/ m+ v! ~: @, f" F
5 inches. There was no other family history of pre-
+ i. K+ H+ s: R c# e# v6 Bcocious sexual development in the first-degree rela-" t7 g( x/ u4 f- K
tives. There were no siblings.
# x' ]4 U! R6 H& K! i3 bPhysical Examination
/ V3 |# w4 Z* @6 ~' T7 LThe physical examination revealed a very active,
: X' a: i; E0 g8 R& y, uplayful, and healthy boy. The vital signs documented) ~, d, V: [+ L9 P6 p q" ~* V
a blood pressure of 85/50 mm Hg, his length was
8 A- T1 [1 f; o/ f' |6 U2 L/ H90 cm (>97th percentile), and his weight was 14.4 kg& ^3 Y% E7 h* I( ~
(also >97th percentile). The observed yearly growth
9 p* f9 D8 H+ M( k Zvelocity was 30 cm (12 inches). The examination of: Q8 R/ [ Q T2 t. ]9 _0 p+ G! r
the neck revealed no thyroid enlargement.4 }9 m _$ ?9 w! l4 J4 A8 a, A
The genitourinary examination was remarkable for. _" X9 A. b; V& m" i6 S6 \; A
enlargement of the penis, with a stretched length of; P4 h) r4 q2 M* D5 ?2 v
8 cm and a width of 2 cm. The glans penis was very well
) h. _' h+ M/ b! z$ V" C, K2 b7 Adeveloped. The pubic hair was Tanner II, mostly around% Y: m/ t! e+ |- y) Q! [
540
% X8 ~0 G! K7 {" Y, P4 ` fat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
: S3 H7 z; w w! Y4 l1 Uthe base of the phallus and was dark and curled. The
: u( G# J- y- U, n1 Atesticular volume was prepubertal at 2 mL each.8 s* q$ K$ }: n+ `# d
The skin was moist and smooth and somewhat
B. S% s) X& }7 ~6 \( l- doily. No axillary hair was noted. There were no+ ~: E1 t9 S8 h1 i3 u B
abnormal skin pigmentations or café-au-lait spots.
3 a& o) f. I9 T0 t4 K/ N( C% Z- tNeurologic evaluation showed deep tendon reflex 2+9 K$ `: r* Y* @
bilateral and symmetrical. There was no suggestion7 G9 C* ~/ T0 `% c5 O9 H
of papilledema.2 h2 Y, ]: t9 v# T0 V
Laboratory Evaluation
@+ z% }* }% t/ I2 bThe bone age was consistent with 28 months by* r8 K0 j( ~& X, `5 Q$ P& ]7 [4 `
using the standard of Greulich and Pyle at a chrono-6 o7 v4 L! X3 a
logic age of 16 months (advanced).5 Chromosomal2 i" r: i; ~/ p9 C
karyotype was 46XY. The thyroid function test
! C# w D i, jshowed a free T4 of 1.69 ng/dL, and thyroid stimu-* j+ v2 [' S' j! S
lating hormone level was 1.3 µIU/mL (both normal).
( Q9 a0 V w; M1 B% TThe concentrations of serum electrolytes, blood
$ |3 J/ |) g/ a! O9 ~- E) D1 {urea nitrogen, creatinine, and calcium all were* C* K. Q$ \; L( h. k, \# k) \
within normal range for his age. The concentration2 ~4 O, v8 Q# `7 y1 I2 |
of serum 17-hydroxyprogesterone was 16 ng/dL
, R) H3 e( A# z: T4 f6 s1 o(normal, 3 to 90 ng/dL), androstenedione was 20$ w+ a( L; K+ K1 ]- k+ g- @
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-' _5 l% R: r7 w z, i
terone was 38 ng/dL (normal, 50 to 760 ng/dL),0 G) A$ m; @4 ]8 i O
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
* r3 |/ a- @7 d& _. F+ j49ng/dL), 11-desoxycortisol (specific compound S) r" l2 F( K, Z+ s% q% `) i
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
! _5 z" [$ z3 h+ M8 R1 Y1 i j7 o" Xtisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total6 c m3 d Q8 C- S9 P7 O
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
' w/ y4 T" C2 g2 o/ Iand β-human chorionic gonadotropin was less than2 F ]' }" k0 {) h! _4 m
5 mIU/mL (normal <5 mIU/mL). Serum follicular
2 `$ K1 J, s- F- q0 Wstimulating hormone and leuteinizing hormone* P8 b0 I# P1 |* Y
concentrations were less than 0.05 mIU/mL
8 Q* I; i8 L; c7 M; {- |' s(prepubertal).. a' w* a9 J2 z8 d+ C' j
The parents were notified about the laboratory8 d- f1 N {+ W5 Z# j
results and were informed that all of the tests were: Z3 X7 D8 I& b( G _
normal except the testosterone level was high. The n [' a* z2 ~& |& u& |- ]
follow-up visit was arranged within a few weeks to
! Y0 Z7 Z! z, O0 ^/ nobtain testicular and abdominal sonograms; how-
* n q0 O( f+ o/ |# Q. u, uever, the family did not return for 4 months.7 G& x# x r! [* g. m
Physical examination at this time revealed that the
4 T. u1 Q+ q: N0 f R# U6 K* n+ V: Lchild had grown 2.5 cm in 4 months and had gained
8 G" P: z3 Q. c5 P) q, V W; t, `2 kg of weight. Physical examination remained- ~6 I! e9 O0 U5 Z% H: K% F
unchanged. Surprisingly, the pubic hair almost com-
+ L- R- G( W" q" B5 G$ ypletely disappeared except for a few vellous hairs at
# k h e4 u0 }2 ]6 b& G3 s. |the base of the phallus. Testicular volume was still 2
# W1 Q! H/ d+ o) x4 N! T% TmL, and the size of the penis remained unchanged.
7 a: X8 s2 P; X* w7 g" tThe mother also said that the boy was no longer hav-
8 t5 x- f- ~6 G% C, ming frequent erections.. o, M k1 Y8 o6 U3 i9 B( [4 P
Both parents were again questioned about use of. c$ ~1 N& U" ~& ?% R, S) |
any ointment/creams that they may have applied to
. @6 _1 a/ {+ f; d3 Y6 ?the child’s skin. This time the father admitted the
: W( |0 ]. O: \( S% g; FTopical Testosterone Exposure / Bhowmick et al 541- @; V6 v- P$ M3 A, F: j
use of testosterone gel twice daily that he was apply-& w2 o) g3 ~9 `/ n4 I5 q) N* v
ing over his own shoulders, chest, and back area for
4 q! R6 s) y1 F. C1 [2 L Pa year. The father also revealed he was embarrassed: S* @8 @) E, E t# p f
to disclose that he was using a testosterone gel pre- I7 ~7 u* u+ Q7 U& h R# v
scribed by his family physician for decreased libido B1 A( f M( s# o
secondary to depression.
, h) ?; T+ y7 l% o+ n, q# cThe child slept in the same bed with parents.* _' I# c+ p! h" l
The father would hug the baby and hold him on his' F5 T3 d3 p6 i; ` c
chest for a considerable period of time, causing sig-# J- G5 e3 S4 s [: H" d
nificant bare skin contact between baby and father.4 Y2 t8 c0 _, R* {: b2 {
The father also admitted that after the phone call,4 Z! ]3 r" u& L9 v/ B1 t, W) C% v& x# \
when he learned the testosterone level in the baby& m% x( P4 l8 y: _
was high, he then read the product information
5 q! `2 R3 ~$ u+ {$ Q$ J7 b. Jpacket and concluded that it was most likely the rea-- L9 E% |) W& d) Q: F, P% A; {+ [
son for the child’s virilization. At that time, they
' Y( h3 Q* Y2 Kdecided to put the baby in a separate bed, and the9 J: I8 ]- W+ S6 }% ?
father was not hugging him with bare skin and had; m. B) X# d U, E
been using protective clothing. A repeat testosterone: T* b* M$ ?3 }* a# Q
test was ordered, but the family did not go to the6 ~4 h7 [6 w6 x- k/ r" y9 L
laboratory to obtain the test.
v/ P( R, u; f, O9 A( c. f, PDiscussion
& G7 ~6 A" E( G: N0 I0 _Precocious puberty in boys is defined as secondary$ D3 s7 ?1 u2 G; \( q; h
sexual development before 9 years of age.1,4
6 g9 D4 \4 H$ m5 }, D" _. lPrecocious puberty is termed as central (true) when, w0 j! E) g8 A- p5 }% I
it is caused by the premature activation of hypo-
8 R0 g' m; i) q7 P/ d* P4 Tthalamic pituitary gonadal axis. CPP is more com-2 E: n) x4 Y, _9 D. q4 w# P1 x- o
mon in girls than in boys.1,3 Most boys with CPP/ m9 t9 J/ r# y0 r+ H
may have a central nervous system lesion that is
% o8 j. _( n5 d$ i" k" V5 F8 [' Aresponsible for the early activation of the hypothal-
) k- z j. E4 d+ gamic pituitary gonadal axis.1-3 Thus, greater empha-& d" y7 n8 k. \3 |9 I6 M" _" @& H
sis has been given to neuroradiologic imaging in& z7 p7 E8 u+ |8 v. C6 Z
boys with precocious puberty. In addition to viril-
% l" A/ }" ]4 V; J% h% U1 U" yization, the clinical hallmark of CPP is the symmet-
8 b9 x# V0 N" r) W6 mrical testicular growth secondary to stimulation by
7 B Q3 @$ a( G" N: {1 c2 ?gonadotropins.1,3
9 C/ z6 U% H( r4 v5 a6 Y9 y ^Gonadotropin-independent peripheral preco-
' V( ~! i, @' m! ^$ Ccious puberty in boys also results from inappropriate: Y3 ?' ~ } M7 ?/ b
androgenic stimulation from either endogenous or
3 k, n5 S7 [, j/ c) H! mexogenous sources, nonpituitary gonadotropin stim-+ r# ^& z3 X- s9 p$ G1 b
ulation, and rare activating mutations.3 Virilizing5 B8 C) W. k) \: t3 \9 y
congenital adrenal hyperplasia producing excessive
( R1 K( w% o" m! [/ V- {% y* Zadrenal androgens is a common cause of precocious2 C0 {2 g+ ^8 g# A( Q
puberty in boys.3,4- [* d) J1 c: s/ g% F& e: Y+ U
The most common form of congenital adrenal% _& V: @0 ~3 a! p9 W9 \, J3 q
hyperplasia is the 21-hydroxylase enzyme deficiency.. n3 ?: i; y! ]* C
The 11-β hydroxylase deficiency may also result in" b/ |) p) j. u" c% V9 ]
excessive adrenal androgen production, and rarely,
" K3 w' `/ a, t/ n* C) ~% e+ }an adrenal tumor may also cause adrenal androgen
h- j O* H" C: n k" Rexcess.1,3
# h! A" [5 f: t% G5 Fat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
; d1 u3 y) b0 _3 h% [4 K542 Clinical Pediatrics / Vol. 46, No. 6, July 2007; p1 F- d6 U7 a
A unique entity of male-limited gonadotropin-
$ A& m. f/ w8 vindependent precocious puberty, which is also known
* F C% \" o7 j# E# e/ X1 ?2 ~as testotoxicosis, may cause precocious puberty at a$ Z1 Z# Q" W# }) ~/ ` v: v
very young age. The physical findings in these boys* I: c0 I$ A- D' b" c/ l9 ^
with this disorder are full pubertal development,9 w% u# o- X- Q2 N
including bilateral testicular growth, similar to boys7 R( D& Z6 K7 @
with CPP. The gonadotropin levels in this disorder9 ~+ o+ E& B7 ]2 n0 m# z/ f0 J
are suppressed to prepubertal levels and do not show
. e1 d: i/ M9 d0 h( W+ ^pubertal response of gonadotropin after gonadotropin-
0 T+ P3 D3 ]$ c( N" ~- j5 Qreleasing hormone stimulation. This is a sex-linked
+ x6 N1 c7 j- gautosomal dominant disorder that affects only
5 O7 Y( t( C0 T r. Rmales; therefore, other male members of the family
* v/ h( h9 q2 i" F+ ymay have similar precocious puberty.3
, ~ S) u8 J! }$ R& R' {. CIn our patient, physical examination was incon-
% _/ {/ m o) ~9 G& B) esistent with true precocious puberty since his testi-% a# q- e' a9 T2 D( g
cles were prepubertal in size. However, testotoxicosis
; W, S/ J, a. I' owas in the differential diagnosis because his father
6 X# H' V0 \5 }8 A: z$ I, R& t' Sstarted puberty somewhat early, and occasionally,, K0 c, \4 F! @1 u# `! ]# X" m3 W
testicular enlargement is not that evident in the9 {& Z8 {& Q1 o4 T
beginning of this process.1 In the absence of a neg-
4 ]0 N! w$ c; N; V @: }ative initial history of androgen exposure, our
5 e* b- f) \$ u/ Z; wbiggest concern was virilizing adrenal hyperplasia,
" z. f" _0 ?) |either 21-hydroxylase deficiency or 11-β hydroxylase
. `% X1 C4 ?, ?, M3 p1 n+ Rdeficiency. Those diagnoses were excluded by find-
4 h9 O% t( B; T4 y+ w4 wing the normal level of adrenal steroids.2 @& Y2 t; b. C. P
The diagnosis of exogenous androgens was strongly
. X r( ]1 G' C0 m4 ksuspected in a follow-up visit after 4 months because. |/ W: \8 x1 Z$ t
the physical examination revealed the complete disap-
; c0 a' C& X* d8 h3 L0 h5 {pearance of pubic hair, normal growth velocity, and2 e; f+ R$ `; |# D: [" x, n0 c
decreased erections. The father admitted using a testos-6 l; N3 v8 I( f
terone gel, which he concealed at first visit. He was
( S1 \" D7 x" ]4 zusing it rather frequently, twice a day. The Physicians’/ L. ^! I' {" b+ c! t. M) u
Desk Reference, or package insert of this product, gel or
6 R- Q( V7 }& E# k7 ccream, cautions about dermal testosterone transfer to* ^7 r4 U; h7 {1 R4 r; ^
unprotected females through direct skin exposure.* T8 i( P3 d9 H2 a* p1 }
Serum testosterone level was found to be 2 times the
5 z! `! W2 x2 ?baseline value in those females who were exposed to1 E) {" B7 G8 b+ F
even 15 minutes of direct skin contact with their male9 h, x/ c5 ]% Y. S5 r
partners.6 However, when a shirt covered the applica-* p4 V" E& R' {" x) p
tion site, this testosterone transfer was prevented.2 r" X" T1 L7 S) A1 E2 D0 l# D
Our patient’s testosterone level was 60 ng/mL,
% L( l& G, L# E2 M1 wwhich was clearly high. Some studies suggest that
' m! ^ x. D/ tdermal conversion of testosterone to dihydrotestos-3 H8 U; \3 o0 {2 i, j
terone, which is a more potent metabolite, is more6 j) n. \; U2 U( C
active in young children exposed to testosterone( _" t# t1 s# X* E
exogenously7; however, we did not measure a dihy-8 O) G. a: M# M/ h
drotestosterone level in our patient. In addition to; w& ]8 q3 }9 L" ]4 j
virilization, exposure to exogenous testosterone in
% Z3 x ]9 x$ }* ^children results in an increase in growth velocity and
$ }0 J; M" I4 m! g* Madvanced bone age, as seen in our patient.
$ y4 B+ o' \% mThe long-term effect of androgen exposure during" w* U8 Q3 \2 S; D D
early childhood on pubertal development and final
% I. I, ]. ?$ W% |adult height are not fully known and always remain
/ N# a. w7 ~ j6 k: `4 T$ d$ P1 ha concern. Children treated with short-term testos-" v Z9 \' u' G
terone injection or topical androgen may exhibit some
: v+ w# q1 f0 L6 W9 I- E7 ~7 }acceleration of the skeletal maturation; however, after
5 N* t8 ]# {" n J; F: |cessation of treatment, the rate of bone maturation
. n, V; z$ q; _! Xdecelerates and gradually returns to normal.8,9
+ q9 v- b/ j8 j& l3 zThere are conflicting reports and controversy
% ?- h' x$ A! ^) D; k9 u+ S- Fover the effect of early androgen exposure on adult: J% L+ v/ G* b+ }+ N% x5 O u
penile length.10,11 Some reports suggest subnormal& |9 a! a0 T/ @7 C) {' S
adult penile length, apparently because of downreg-
2 k" z9 M4 `; J1 w( t/ oulation of androgen receptor number.10,12 However,
/ c+ p, z4 y7 SSutherland et al13 did not find a correlation between
$ c5 k& s9 Q( V' \childhood testosterone exposure and reduced adult
b0 o4 ?) O6 P0 I+ P: K$ Jpenile length in clinical studies.* L! y; G9 d% K
Nonetheless, we do not believe our patient is2 d% u; D8 J+ ~( z
going to experience any of the untoward effects from
! V, N5 N6 X9 @; `% N3 i* Etestosterone exposure as mentioned earlier because
9 N) w% H- b" `7 M h. uthe exposure was not for a prolonged period of time.7 K+ `0 A, `3 a+ z1 H; r
Although the bone age was advanced at the time of
! R5 t G2 N$ z1 _2 u/ Gdiagnosis, the child had a normal growth velocity at( O" P* F l( i% C0 Q, a
the follow-up visit. It is hoped that his final adult
# {1 Z* {4 c! W8 t$ Mheight will not be affected.0 l5 l! ]+ s! H6 s
Although rarely reported, the widespread avail-
# V( ]5 \# N! y w9 Iability of androgen products in our society may
) [2 E- p$ y5 v8 k3 V6 jindeed cause more virilization in male or female
/ V6 c3 d& {) c# A" L; j- e6 Nchildren than one would realize. Exposure to andro-
$ [3 D4 K B1 i" l, o- v% j. r' ogen products must be considered and specific ques-
# L7 L7 @. G# c2 Mtioning about the use of a testosterone product or3 y! z' S# k: V9 b. C$ i
gel should be asked of the family members during9 W/ B/ r; Q9 \8 l1 c
the evaluation of any children who present with vir-
/ |- E) ~' R* P; h$ eilization or peripheral precocious puberty. The diag-8 ^' X% f, e Q: G) l2 d
nosis can be established by just a few tests and by
% H, s P; s7 w4 Wappropriate history. The inability to obtain such a* `5 u1 |0 z# ?& A4 C
history, or failure to ask the specific questions, may
/ ~/ t) a# _' h. u5 x C oresult in extensive, unnecessary, and expensive4 M0 o+ I q, s
investigation. The primary care physician should be
# a, C& z+ b# u4 W/ ^aware of this fact, because most of these children
' Z$ v3 O0 F" L) Smay initially present in their practice. The Physicians’
$ D; R1 R. q3 i" Z+ o+ O4 W4 xDesk Reference and package insert should also put a
6 ?" T. `) m. ?warning about the virilizing effect on a male or
% c- Q# M: t8 tfemale child who might come in contact with some-
4 s2 ?& h7 C. q9 E, t Z5 d cone using any of these products.1 o q3 B; k0 M
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2002: 565-628.
3 n: J% p' K" c3 l# W1 r: {2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
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Pediatric Endocrinology. 4th ed. New York, NY: Marcel
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3 u5 Q' w$ o0 C. r$ t: u* M: _5. Greulich WW, Pyle SI, eds. Radiographic Atlas of
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' T4 P9 o2 j3 fStanford, CA: Stanford University Press; 1959.( m5 g1 |! l7 e. }+ ^) ?
6. Physicians’ Desk Reference. Androgel 1% testosterone,! ?& g, `' o% m0 N/ `3 o1 w
Unimed Pharmaceutical Inc. Montvale, NJ: Medical
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1 f5 M4 a9 l8 b9 M" F! D8 J. S7. Klugo RC, Cerny JC. Response of micropenis to topical
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