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is a significant concern for physicians. Central4 u( o6 L2 T; \" x
precocious puberty (CPP), which is mediated! r& D' k( U2 H9 i- P. O6 [
through the hypothalamic pituitary gonadal axis, has
& B) F& l0 N, I, P$ c0 E! ma higher incidence of organic central nervous system% Q: g5 i- X6 K
lesions in boys.1,2 Virilization in boys, as manifested
8 [) J9 z; Q9 D& X I: `by enlargement of the penis, development of pubic: K6 X0 q; V, x: v8 R. k9 K
hair, and facial acne without enlargement of testi-
% g! L8 T% n9 G. ~4 j' F( N- @9 Pcles, suggests peripheral or pseudopuberty.1-3 We
8 n2 i4 ]4 u% d8 @report a 16-month-old boy who presented with the: ]: ^3 c" b! K: l
enlargement of the phallus and pubic hair develop- X3 n' O( ]/ T# ]& i3 `
ment without testicular enlargement, which was due
0 G& I; R* P. V4 `4 j$ Rto the unintentional exposure to androgen gel used by
, C/ F2 p. Q- Q3 Y1 U' jthe father. The family initially concealed this infor-
$ T/ x8 x. M2 Hmation, resulting in an extensive work-up for this
' {. w l$ ?% D- [) Dchild. Given the widespread and easy availability of, T4 a9 x( O% s1 |7 @5 s& C
testosterone gel and cream, we believe this is proba-
1 {* A9 |, l; t2 P3 E! gbly more common than the rare case report in the3 ]- {: Q5 l& Z: s
literature.4
) j4 H6 d) b7 m" g0 \Patient Report
8 b5 s8 X1 r" C- zA 16-month-old white child was referred to the0 t. x" ~8 q6 H9 f( T; d9 {2 a
endocrine clinic by his pediatrician with the concern
& a- |. ]4 t3 V8 G7 \' dof early sexual development. His mother noticed0 n' e4 l7 S2 G1 P: v
light colored pubic hair development when he was# X; b6 k' t8 k2 K9 g2 {
From the 1Division of Pediatric Endocrinology, 2University of' }, h: x7 e. t5 n. V$ v* V
South Alabama Medical Center, Mobile, Alabama.
4 Y! P0 W& G0 z/ UAddress correspondence to: Samar K. Bhowmick, MD, FACE,
% L" P3 i& N3 [# JProfessor of Pediatrics, University of South Alabama, College of- H u s y% r. O, G
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;+ ~' O9 n- G1 b* q `
e-mail: [email protected].4 ~ e' o' x: L5 P" `, ?2 C
about 6 to 7 months old, which progressively became/ S& p; l; A) r* V, x/ @, o- [
darker. She was also concerned about the enlarge-" X q9 }1 w4 A9 R Y+ T' p
ment of his penis and frequent erections. The child
9 w- ~4 ~1 c* U6 G( ewas the product of a full-term normal delivery, with
C! u' Y, N2 E( ma birth weight of 7 lb 14 oz, and birth length of
' d; \: e g6 N- y. b20 inches. He was breast-fed throughout the first year
/ ]; P4 ~& j Uof life and was still receiving breast milk along with
; @2 C1 b+ G5 t" c* S& Q; _solid food. He had no hospitalizations or surgery,5 d4 s9 c4 e3 [* {0 J
and his psychosocial and psychomotor development
* @% h4 L0 M) I& E7 a+ kwas age appropriate.
! ~! g8 I, j- F% ^The family history was remarkable for the father,
' E g1 E8 N1 K" m8 r# wwho was diagnosed with hypothyroidism at age 16,8 @- Q0 b& k, e6 H: p& O
which was treated with thyroxine. The father’s3 P4 V6 e9 f4 Q( Z: [
height was 6 feet, and he went through a somewhat
/ ?# l# O& I% } V2 Q& Searly puberty and had stopped growing by age 14.! Q" c Z" L/ k& M" x: E/ W% g
The father denied taking any other medication. The8 k* r( S, j3 U+ B ]6 K
child’s mother was in good health. Her menarche
' `0 F! C/ v7 H) Swas at 11 years of age, and her height was at 5 feet$ T& O3 B/ [! ^1 l
5 inches. There was no other family history of pre-
2 F. R2 g+ _" v+ }4 |cocious sexual development in the first-degree rela-
- c$ R$ s; O) k% T1 `tives. There were no siblings.
. r5 ?4 \2 h3 M9 j4 q4 D5 NPhysical Examination$ R7 C" |& I3 \$ }% M1 K3 j
The physical examination revealed a very active,
2 M" s4 s1 y6 |4 x$ A) Tplayful, and healthy boy. The vital signs documented
7 Q7 W7 G2 T5 ~1 Pa blood pressure of 85/50 mm Hg, his length was
7 R, N# p' h% d) c1 B0 Z4 u5 u90 cm (>97th percentile), and his weight was 14.4 kg
9 q, ?" m8 ~7 D5 J8 w- K/ I(also >97th percentile). The observed yearly growth7 M2 W, }) m* E5 Q& |7 q' x6 ?+ ~
velocity was 30 cm (12 inches). The examination of6 F# Y6 P$ E s
the neck revealed no thyroid enlargement.
6 e3 g C' _* K) oThe genitourinary examination was remarkable for
. v$ {" F, \/ H3 f* x) t( r/ Benlargement of the penis, with a stretched length of
* Z d/ M; N% O. }8 cm and a width of 2 cm. The glans penis was very well c: ^1 l0 z2 i7 ~( Z; z- L
developed. The pubic hair was Tanner II, mostly around6 H! u# E8 Q% l4 i. q5 v
540
) k% @ e$ T9 [: b0 Nat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
' [5 o. G; A) q% h, mthe base of the phallus and was dark and curled. The
( w/ h4 Z4 B i& Z8 }1 J: g# xtesticular volume was prepubertal at 2 mL each.$ ~; N$ n! S# \" P. O0 r
The skin was moist and smooth and somewhat6 R0 W2 A1 M# v- x
oily. No axillary hair was noted. There were no
; p+ |. u! m& o8 z4 Yabnormal skin pigmentations or café-au-lait spots.3 s4 e0 X7 U a; G. T5 J* Y1 b
Neurologic evaluation showed deep tendon reflex 2+( `$ r# o8 |) t+ @$ U& Q3 N
bilateral and symmetrical. There was no suggestion
) U# A. [: d e2 cof papilledema.3 ]" f. g; R1 M2 Q* ?" S
Laboratory Evaluation' {" u! Z( U$ M9 ]
The bone age was consistent with 28 months by/ E+ W, X4 m/ r" D* r
using the standard of Greulich and Pyle at a chrono-2 L$ O# Z' k+ b+ S/ F. p* F
logic age of 16 months (advanced).5 Chromosomal
3 f; t( ^, X' Dkaryotype was 46XY. The thyroid function test
6 p4 d4 w. ^! K1 Ishowed a free T4 of 1.69 ng/dL, and thyroid stimu-
% ^! q% V; p) Q" ?* q& D2 elating hormone level was 1.3 µIU/mL (both normal).2 i7 {( A6 o! q
The concentrations of serum electrolytes, blood
" C0 P( i" G$ c8 t, l/ g; H% Z# curea nitrogen, creatinine, and calcium all were
8 t* f* ?* m* X7 f, |within normal range for his age. The concentration' r/ |1 Z7 V2 W& n8 K$ [1 ]/ }( F
of serum 17-hydroxyprogesterone was 16 ng/dL; [8 \" k/ H. w. J
(normal, 3 to 90 ng/dL), androstenedione was 206 m2 y# r6 R+ }7 `# f( C9 Z
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-( S1 N. h) Q" w7 Z# _; `
terone was 38 ng/dL (normal, 50 to 760 ng/dL),3 ?+ F7 h w0 R2 j4 q
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
- J% O% _4 y7 k+ c6 x49ng/dL), 11-desoxycortisol (specific compound S) w0 }$ y$ s+ s; [9 X
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
; m W8 M3 w6 `! Ntisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total: m' K; V# Y. j# n) q% j
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),. B" b3 y9 W A; ] r
and β-human chorionic gonadotropin was less than
7 x* t' s* U6 H" C% r5 mIU/mL (normal <5 mIU/mL). Serum follicular9 t3 U9 U, y2 t9 d. ~' [
stimulating hormone and leuteinizing hormone
: {& H* J! O' C" A7 {9 u' xconcentrations were less than 0.05 mIU/mL$ N! r7 J4 G# p2 J& e/ T
(prepubertal).
: F: ]. T5 Q zThe parents were notified about the laboratory+ G8 A* c; a# c! X7 W
results and were informed that all of the tests were* A& }. F& y5 G; f
normal except the testosterone level was high. The0 @. l n/ m% `1 _4 H! i. B( [3 h- P
follow-up visit was arranged within a few weeks to0 ~' q7 v* @- P& W- @+ C6 R
obtain testicular and abdominal sonograms; how-
3 ?& z p# U' e4 jever, the family did not return for 4 months.
8 |1 Q. m9 T& f6 C0 y, h1 D! o3 SPhysical examination at this time revealed that the. C# T/ r8 B2 M u! _/ H* C; D
child had grown 2.5 cm in 4 months and had gained
6 H) y& O6 g, x- L+ {5 l! N9 u, P2 kg of weight. Physical examination remained- ~6 s$ J/ z: `8 F2 @+ P$ d
unchanged. Surprisingly, the pubic hair almost com- p. @! b' v) s& n# S) Z/ p* r
pletely disappeared except for a few vellous hairs at
, S+ }/ I3 j8 y* `% [# y$ t+ f0 }6 Dthe base of the phallus. Testicular volume was still 2" O0 z2 w( Z0 x: [
mL, and the size of the penis remained unchanged.
3 i9 T1 V3 w' D. f3 x! O$ a9 QThe mother also said that the boy was no longer hav-
! h/ B8 L5 p0 {$ h- p1 hing frequent erections.
0 i+ _8 d8 n) m& M, y- fBoth parents were again questioned about use of1 _ O6 {1 U7 g% n6 V% J+ Y, a8 `% P
any ointment/creams that they may have applied to
& X+ e4 _8 o# F8 Rthe child’s skin. This time the father admitted the+ [8 [" ~7 R3 K
Topical Testosterone Exposure / Bhowmick et al 5414 F* K5 C: a% Q# e
use of testosterone gel twice daily that he was apply-" e9 c+ s/ ]) @4 |% ^ q# y
ing over his own shoulders, chest, and back area for
( K4 J1 F: X8 a9 ~% pa year. The father also revealed he was embarrassed% l0 Q2 Z( T8 R3 k, m
to disclose that he was using a testosterone gel pre-
; r1 l* _$ B- p: H vscribed by his family physician for decreased libido
! O: w" q8 A9 g7 t o( qsecondary to depression.& L% B, O3 H5 V2 j! g* s0 K
The child slept in the same bed with parents.+ S3 b8 Q, N2 Q1 U# W6 S
The father would hug the baby and hold him on his
0 I$ W: N) Y# q3 v7 W7 i; F, s$ Zchest for a considerable period of time, causing sig-
; d9 a) c. k! x0 wnificant bare skin contact between baby and father.! f& {/ G& S; x. r+ g" r, ?
The father also admitted that after the phone call,
6 v& \, O8 s: |. P& \ Uwhen he learned the testosterone level in the baby
# P3 r5 M' [0 B2 ~3 w# ^! Ywas high, he then read the product information: n3 t+ B% O5 `* W# J8 Z, z
packet and concluded that it was most likely the rea-
3 _2 R3 F& f7 {: }8 w1 _* Sson for the child’s virilization. At that time, they
/ t, q9 p( v9 w* g- Tdecided to put the baby in a separate bed, and the- d% k! j3 s: W
father was not hugging him with bare skin and had$ O2 Y# A4 `$ J
been using protective clothing. A repeat testosterone
9 q! M2 o; Y6 \) W- `- m2 wtest was ordered, but the family did not go to the
# n( V# M3 ~$ ~! p& K( claboratory to obtain the test.- n0 Y- m0 l5 q9 y, i
Discussion
, b9 I4 D# L! A9 J7 L" |; K% uPrecocious puberty in boys is defined as secondary$ m0 s- `1 t6 ~% Q- ~% U0 C7 v
sexual development before 9 years of age.1,42 w( u/ Z% ]6 R' N U, ]
Precocious puberty is termed as central (true) when
5 F# r+ G1 a- I, B, Oit is caused by the premature activation of hypo-
( b7 s5 _! }8 |; q) x% a: w) Cthalamic pituitary gonadal axis. CPP is more com-
& G' ^# @3 f! P5 F% ?mon in girls than in boys.1,3 Most boys with CPP3 p* s/ L$ T/ T- D& l9 j/ l
may have a central nervous system lesion that is
! a# N3 B, R! Y% J: x# H9 Fresponsible for the early activation of the hypothal-
: V8 ?5 L T. I6 t- {amic pituitary gonadal axis.1-3 Thus, greater empha-' O) i+ }1 [' |8 B' {# v: S
sis has been given to neuroradiologic imaging in9 Y( a$ Y& J& d2 _) S; n& l+ p
boys with precocious puberty. In addition to viril-% W ^& c2 P% p' G( x: R
ization, the clinical hallmark of CPP is the symmet- R4 ]7 p# G* H# ] ]" E; z/ b9 ?/ }
rical testicular growth secondary to stimulation by
v0 l1 q* W1 xgonadotropins.1,3
5 ^$ v0 K" D3 v2 C7 LGonadotropin-independent peripheral preco-
+ m0 K" W: z n) ?cious puberty in boys also results from inappropriate# O9 F7 O; R0 v7 y
androgenic stimulation from either endogenous or* S1 H# {& A6 c, k8 G+ R; D* y* P' S+ }
exogenous sources, nonpituitary gonadotropin stim-
% ]. r8 \$ u. X- Y9 `9 g a1 d9 L; ~ulation, and rare activating mutations.3 Virilizing0 E& i0 O# D. h0 l( ~, p
congenital adrenal hyperplasia producing excessive
' } z2 A9 S' T: U F. ~adrenal androgens is a common cause of precocious
2 T2 \- E3 F+ u- h5 i* |0 _) npuberty in boys.3,4
R* g2 _3 h2 H4 T/ |5 }The most common form of congenital adrenal
% A* N5 F4 l3 m. |( b$ }hyperplasia is the 21-hydroxylase enzyme deficiency.8 D* P4 Q; o' d$ w4 t* R8 G
The 11-β hydroxylase deficiency may also result in' e* Y9 \5 n8 `3 P& C: _ `6 ~1 }/ j
excessive adrenal androgen production, and rarely,
9 Y% y+ Q/ |( n0 N7 |" O' [an adrenal tumor may also cause adrenal androgen
. m0 }, D6 w5 Q9 S% texcess.1,3. |- D& I0 n! D6 J( G
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from- v, E& `3 T# S! U6 v
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
w" F% ? f3 aA unique entity of male-limited gonadotropin-( s! ~3 ^" q2 A! N- U
independent precocious puberty, which is also known0 Z b$ |' d. G o
as testotoxicosis, may cause precocious puberty at a4 B- b" W' c2 r) M6 i
very young age. The physical findings in these boys+ o6 d6 i0 O: z" M! m/ S3 O5 i( f
with this disorder are full pubertal development,
. _# ] n4 u' Q# [9 U* B6 ~& ~including bilateral testicular growth, similar to boys
- K" ]. ?9 p3 I& h+ l" rwith CPP. The gonadotropin levels in this disorder
: j+ `' t) d1 E& R( Eare suppressed to prepubertal levels and do not show
$ G% V/ Q4 _+ v1 d6 apubertal response of gonadotropin after gonadotropin-
9 V' [) `! b5 D* f. |0 ~releasing hormone stimulation. This is a sex-linked c, j! `1 a/ b2 J& F
autosomal dominant disorder that affects only- t. ?6 X& p. ~9 c- Q
males; therefore, other male members of the family" {( z+ h$ e3 q, t
may have similar precocious puberty.38 n: o# m" ^" v7 x+ ?- x3 t! d
In our patient, physical examination was incon-
+ q J$ ]3 |4 W! U2 Qsistent with true precocious puberty since his testi-/ O3 P) R' S7 m* o) x
cles were prepubertal in size. However, testotoxicosis
( [! h! ?! X6 V# L9 N* Cwas in the differential diagnosis because his father
0 t( G* G& P9 Vstarted puberty somewhat early, and occasionally,- }# Z9 p$ A1 G$ P
testicular enlargement is not that evident in the( n% b; `5 g' |* y" Q2 Y* g0 L
beginning of this process.1 In the absence of a neg-
% w. h+ j1 r* r' _6 A' @; mative initial history of androgen exposure, our5 _" z+ [$ s% I! E+ C- ?
biggest concern was virilizing adrenal hyperplasia,/ P/ f0 m/ m- h/ l, O' O
either 21-hydroxylase deficiency or 11-β hydroxylase
, Y2 S) W- N# H3 ^$ hdeficiency. Those diagnoses were excluded by find-/ v- g! N' T, M, z
ing the normal level of adrenal steroids.0 ]3 c& B# r# F) L v4 p
The diagnosis of exogenous androgens was strongly
! M- C% q4 R# R1 y# e: A% p nsuspected in a follow-up visit after 4 months because! t" \6 O- x$ F9 f3 `
the physical examination revealed the complete disap-6 c) K3 t5 k+ Q0 c+ f! ]* q
pearance of pubic hair, normal growth velocity, and
0 L% }. J _$ ?& m$ j! Tdecreased erections. The father admitted using a testos-
# D, w0 C9 t) H3 p2 S9 k0 jterone gel, which he concealed at first visit. He was O ^3 m" v M1 M' o. L9 B0 Y
using it rather frequently, twice a day. The Physicians’% k4 m$ x! j, F, A) ?* `
Desk Reference, or package insert of this product, gel or
: I* l; \) M$ d% L' ?6 Y. Fcream, cautions about dermal testosterone transfer to
1 m* b: f/ h( a) o: Yunprotected females through direct skin exposure.
6 T& N) `1 _0 |- z' Z8 }+ }* m1 oSerum testosterone level was found to be 2 times the {" m! g5 Z. e+ f! s
baseline value in those females who were exposed to! `8 i) P1 x5 Y9 a" v
even 15 minutes of direct skin contact with their male
! P, M& }- v5 t) O Ipartners.6 However, when a shirt covered the applica-
& p% j5 [; U2 C1 T" Xtion site, this testosterone transfer was prevented.
6 R( P2 g# [2 GOur patient’s testosterone level was 60 ng/mL,
6 b/ t) B, T9 Z2 M) Cwhich was clearly high. Some studies suggest that \( c& F: Z' p w% j
dermal conversion of testosterone to dihydrotestos-
( ]1 `1 \! g. o' z. {, c3 rterone, which is a more potent metabolite, is more
) n' w' c( @5 \9 `active in young children exposed to testosterone% y0 A, ?5 o- Q0 P1 B2 C
exogenously7; however, we did not measure a dihy-
, m9 k+ Q" M* D( W) qdrotestosterone level in our patient. In addition to8 l- v0 T, L6 H; a' h
virilization, exposure to exogenous testosterone in
% W( q0 x; ?# j* {& S ^, c& Tchildren results in an increase in growth velocity and$ }# D. b; K6 D7 L$ v( P
advanced bone age, as seen in our patient.
* p) x+ _( E ]The long-term effect of androgen exposure during, v2 |: h2 C0 H$ F) G
early childhood on pubertal development and final* @. ~0 W* k8 W' U' G& V0 |% N
adult height are not fully known and always remain
0 L. @! a# c6 ca concern. Children treated with short-term testos-, s9 y1 E$ n- e" H/ U1 `
terone injection or topical androgen may exhibit some
' O9 h9 v5 d; J( bacceleration of the skeletal maturation; however, after
" T1 Y" W) s/ Q$ icessation of treatment, the rate of bone maturation) D! O. T" c. a8 l$ w+ w* R7 g
decelerates and gradually returns to normal.8,9" p5 U& N" v N" ?2 \
There are conflicting reports and controversy+ d5 G3 ~. K7 Y
over the effect of early androgen exposure on adult
- |6 U, o @, K; `' P7 F( e% Apenile length.10,11 Some reports suggest subnormal
& H6 }8 Q( @$ v( O. Nadult penile length, apparently because of downreg-
/ H& i; h# T6 A8 L8 _, A. [2 fulation of androgen receptor number.10,12 However, {+ B$ E6 I1 t
Sutherland et al13 did not find a correlation between
3 V" |* N! a8 T/ t8 ^0 G. Wchildhood testosterone exposure and reduced adult6 Q/ P; p3 L3 p0 ?+ e! Z, c
penile length in clinical studies.6 G+ `( q. u5 g% a- c4 D. j
Nonetheless, we do not believe our patient is8 ?" L1 V( z1 x B g$ d- O
going to experience any of the untoward effects from
1 N/ y7 ^2 Z* @0 T4 dtestosterone exposure as mentioned earlier because! R& W1 }* f7 X, T! E! ?9 m- h
the exposure was not for a prolonged period of time.
- ?' k* b: z9 L' D* i: sAlthough the bone age was advanced at the time of X) q8 a& Z3 W. {! h
diagnosis, the child had a normal growth velocity at8 d! e) B# H" a8 x" k% x
the follow-up visit. It is hoped that his final adult2 M9 F7 [, X4 x9 U5 [( V& E
height will not be affected.
% ^+ p- I( Y* a7 ?9 K) ]: D$ p/ XAlthough rarely reported, the widespread avail-9 X! `/ m9 H2 L7 U5 G; ?
ability of androgen products in our society may
e3 d6 V2 v2 windeed cause more virilization in male or female
6 P4 o, }! ~4 ]8 f6 u% schildren than one would realize. Exposure to andro-; k3 ]- ?- j9 `% C9 |# H
gen products must be considered and specific ques-; l6 A# [! B# H, `! W2 z
tioning about the use of a testosterone product or. z& Q3 [9 c% V% a& J7 I' l2 W' U
gel should be asked of the family members during
0 I+ m$ u/ Q% q s1 {: ^; ^4 ythe evaluation of any children who present with vir-& W( Q- ~5 A: t) N# ^# b
ilization or peripheral precocious puberty. The diag-
8 A! d. ?: R$ ^, n% Z8 m0 w2 R; C `nosis can be established by just a few tests and by
) g) _' Q, y) h# j2 T) `- i* O/ Qappropriate history. The inability to obtain such a+ r$ ~( ?9 W" z
history, or failure to ask the specific questions, may* V0 y+ R. j# s; Q: ^/ g j
result in extensive, unnecessary, and expensive
' Q. q2 e \) S! Ainvestigation. The primary care physician should be9 w+ l/ H4 U/ D5 O$ I
aware of this fact, because most of these children
3 Q2 [2 A5 a6 Cmay initially present in their practice. The Physicians’
5 r) D/ Z, C: Q2 L( M M0 `Desk Reference and package insert should also put a$ W+ q' K$ ~5 x3 D! h7 L
warning about the virilizing effect on a male or# C8 ^" ]9 v" b6 E4 d% B
female child who might come in contact with some-
- h- {* `8 C/ B$ A7 [$ Mone using any of these products.
1 W) c# w' j9 K. E, c, ]- l1 SReferences
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2002: 565-628.1 W$ u$ [! \" [
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
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* g1 p$ M. v6 B3 q7 ]development in a two-year-old boy induced by topical) p& `. J" D5 p; x7 l
exposure to testosterone. Pediatrics. 1999;104:e23.! V$ M0 K9 R" f6 ]! U: w
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Z) `( ^% |+ j- l$ I% xStanford, CA: Stanford University Press; 1959.
+ Q+ X% P! a9 {6. Physicians’ Desk Reference. Androgel 1% testosterone,
- y: [/ d( a2 L! Z% YUnimed Pharmaceutical Inc. Montvale, NJ: Medical3 X! Z r; @$ `# \9 T: I
Economics Company, Inc; 2004:3239-3241.
_" P3 n; S, J2 {% N( `0 g7 W7. Klugo RC, Cerny JC. Response of micropenis to topical9 l- l7 @! e! t9 T) M/ F9 N, C2 _% ~
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