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is a significant concern for physicians. Central
- ^8 i6 K1 A% @+ b: Lprecocious puberty (CPP), which is mediated7 H& D, i% H" N8 y, Z' |) L
through the hypothalamic pituitary gonadal axis, has( }$ H2 w' p. w0 k# c# d; t3 w5 U
a higher incidence of organic central nervous system
+ ]+ X! [0 H! s Y$ |: F7 nlesions in boys.1,2 Virilization in boys, as manifested5 N6 s* i6 m. w0 O6 A9 _6 O
by enlargement of the penis, development of pubic. w1 e- H7 m5 U, W7 v3 X/ b4 x1 c# w
hair, and facial acne without enlargement of testi-2 q4 {+ w ]! A5 l1 ? S* a
cles, suggests peripheral or pseudopuberty.1-3 We6 G. g' x0 W/ B# |. _3 ]
report a 16-month-old boy who presented with the3 ], E# H* P! F
enlargement of the phallus and pubic hair develop-
( U8 J7 { O$ _0 Vment without testicular enlargement, which was due7 D4 B- O! H9 [
to the unintentional exposure to androgen gel used by
& G( I4 w3 F6 {0 Ythe father. The family initially concealed this infor-
% W7 _$ f- b; E- K) Qmation, resulting in an extensive work-up for this) [1 L& R- s+ n3 I6 C, a
child. Given the widespread and easy availability of1 n" _1 ]% O% i, g& S
testosterone gel and cream, we believe this is proba-
3 x' |7 R& f7 Q. |. m6 ]. T# Ubly more common than the rare case report in the& j& h2 t) R Z9 j# N
literature.4
. H8 \1 k' x5 ]& IPatient Report" Z' t4 H% K' [% x% i' E6 g
A 16-month-old white child was referred to the* l" |) ?4 ^0 s8 s2 I
endocrine clinic by his pediatrician with the concern, q* e: h' a1 |: A7 n! i6 e* l. L
of early sexual development. His mother noticed3 H3 R3 P/ I' i4 K# E, y
light colored pubic hair development when he was
$ C; ?- }* c. \, e; v1 xFrom the 1Division of Pediatric Endocrinology, 2University of
9 V5 Z! T9 r% D" JSouth Alabama Medical Center, Mobile, Alabama.
6 U. J' d5 l3 T" rAddress correspondence to: Samar K. Bhowmick, MD, FACE,0 Q2 D H3 b* S" s" b6 y
Professor of Pediatrics, University of South Alabama, College of
/ o3 \1 k4 Q& K, }Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
$ U9 o7 _" C# C( k2 o- [) ne-mail: [email protected].& I; b0 N) b X' h% ^+ f
about 6 to 7 months old, which progressively became
! Y% Y! G" c/ @" B( M4 f, G, Kdarker. She was also concerned about the enlarge-4 K, [9 J* P5 S
ment of his penis and frequent erections. The child! r0 U: V) ?) o
was the product of a full-term normal delivery, with% z6 P% y4 R3 Z7 l7 q8 I& K
a birth weight of 7 lb 14 oz, and birth length of
6 B- l! ]- X& J. T9 m! n' r20 inches. He was breast-fed throughout the first year9 \. H, P( [0 X8 }9 V
of life and was still receiving breast milk along with
q" P/ m- U( T: fsolid food. He had no hospitalizations or surgery,, k# @1 q9 l5 X- t8 C" y/ L
and his psychosocial and psychomotor development
! X: m! w9 A9 O9 `was age appropriate.
' T1 c" z" I& e% i$ N" JThe family history was remarkable for the father,. `1 d# f! M5 f7 H( j+ v
who was diagnosed with hypothyroidism at age 16,' ]% s2 c: O0 ?7 S5 E v2 ^9 q
which was treated with thyroxine. The father’s
6 d9 ~; p' X- d8 Wheight was 6 feet, and he went through a somewhat
# S$ j7 l4 ]8 Y% W& o& o$ Gearly puberty and had stopped growing by age 14.
& E% Y1 @+ a6 Y' y0 qThe father denied taking any other medication. The
9 U' O: Q" Y8 H% echild’s mother was in good health. Her menarche2 E5 G# m) k2 [1 J% i% @3 \
was at 11 years of age, and her height was at 5 feet0 M) j# E$ G2 ~3 I1 f$ k& l
5 inches. There was no other family history of pre-
4 Q4 G9 j/ P& `" z8 z' B3 Ycocious sexual development in the first-degree rela-
# @% J% d( _0 |9 Z9 Ftives. There were no siblings.0 p6 e i6 A9 G+ T
Physical Examination) z1 I! E8 r4 W g
The physical examination revealed a very active,; w% Q S8 V* `/ H' L& i
playful, and healthy boy. The vital signs documented
% J; w3 J3 L4 I& N+ @a blood pressure of 85/50 mm Hg, his length was6 J0 z @! Q }1 I& V8 v
90 cm (>97th percentile), and his weight was 14.4 kg }& {/ q V( k* M0 G( `+ v
(also >97th percentile). The observed yearly growth/ o/ V" B- C3 k
velocity was 30 cm (12 inches). The examination of" Q0 P' R+ j4 u; D' ]3 D1 s
the neck revealed no thyroid enlargement.6 k# k5 ^" F7 `
The genitourinary examination was remarkable for3 `; b U$ J1 t4 Q5 d0 k
enlargement of the penis, with a stretched length of
9 p& O; f9 L* L& ~, r" O, H8 cm and a width of 2 cm. The glans penis was very well
" s( C9 U Y+ m; h7 {7 V3 A9 Bdeveloped. The pubic hair was Tanner II, mostly around2 x8 ]' x- M6 n; ]4 Y( F$ v
540
8 }1 W4 w$ K% F& Z% Yat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from$ C- e" d; R& j( Z- E9 G* n" n9 \
the base of the phallus and was dark and curled. The
( V' K! w8 M% j! i1 N: Ztesticular volume was prepubertal at 2 mL each.
2 I+ R# l# S: h. [The skin was moist and smooth and somewhat8 n% S' _) }6 P! A3 l
oily. No axillary hair was noted. There were no
+ v( E, o4 f& K& {) [abnormal skin pigmentations or café-au-lait spots.5 r: }$ }: ]' J! i
Neurologic evaluation showed deep tendon reflex 2+
( t0 z4 B9 b+ [, j$ Q& V3 h3 [( lbilateral and symmetrical. There was no suggestion. Z. G E' U4 K9 @& N" f
of papilledema.: D- j7 E; t9 ^& a0 d
Laboratory Evaluation" u# A- ]$ q" V# I( w5 U& J
The bone age was consistent with 28 months by- z- g- k& u9 b! }* P- [
using the standard of Greulich and Pyle at a chrono-/ S9 @5 ?, t6 v
logic age of 16 months (advanced).5 Chromosomal" w# N. d0 ^) v! |: K: ?2 i, p
karyotype was 46XY. The thyroid function test
) y I9 _3 |/ _5 @. q9 P, Qshowed a free T4 of 1.69 ng/dL, and thyroid stimu-8 c# F4 F- a6 n. v9 s
lating hormone level was 1.3 µIU/mL (both normal).
0 Z: T; ]9 g9 @( K3 i- C# z7 jThe concentrations of serum electrolytes, blood
, A# t! Y" P- R3 f _ {urea nitrogen, creatinine, and calcium all were
2 Y( N+ U* _8 m! G V$ [" Owithin normal range for his age. The concentration
/ {1 e( M, K2 O4 V. t/ |of serum 17-hydroxyprogesterone was 16 ng/dL5 J6 f, b$ D, J4 b C
(normal, 3 to 90 ng/dL), androstenedione was 20
3 r& E k/ y: R# v( W) v3 Yng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
0 i2 H, j6 r3 Y& p! L; q, u i8 cterone was 38 ng/dL (normal, 50 to 760 ng/dL),6 G x a3 Q( T' t1 p
desoxycorticosterone was 4.3 ng/dL (normal, 7 to2 y$ Z3 ?* t4 n, D5 L+ H
49ng/dL), 11-desoxycortisol (specific compound S)
/ f3 ?+ I6 |5 g5 cwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor- Y- E. Z! c0 m& B6 n" A1 J
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
7 t% H: J9 j* t( ?5 ^( N" E4 stestosterone was 60 ng/dL (normal <3 to 10 ng/dL)," n/ n" f% ]( b. g _
and β-human chorionic gonadotropin was less than* @, J, ?" Q; k ~0 z' o3 F5 M% }
5 mIU/mL (normal <5 mIU/mL). Serum follicular
0 W0 Z! p6 ?2 S" G5 J; Bstimulating hormone and leuteinizing hormone2 R7 x, j8 A: I1 O# C$ s
concentrations were less than 0.05 mIU/mL: ]: D7 ^; R2 N: g ]9 ~0 ?2 d9 E
(prepubertal).
, C5 g! D& B) y% [5 G' z: y8 nThe parents were notified about the laboratory
; `; l# h* }6 {" ~results and were informed that all of the tests were
. E2 k4 l8 q+ ~; b& x& { cnormal except the testosterone level was high. The/ d; `6 ]# r5 k/ |
follow-up visit was arranged within a few weeks to
) J8 e7 c& r# H# v0 e- I& k$ Sobtain testicular and abdominal sonograms; how-8 h p- g1 J/ @3 \9 a, X* F
ever, the family did not return for 4 months.
( ]! M ?& N. O# T' K- hPhysical examination at this time revealed that the
! `8 S7 f) @2 M% W* ]child had grown 2.5 cm in 4 months and had gained
7 K2 h# e- e6 V2 C" \" p3 e2 kg of weight. Physical examination remained
( r6 ^( n% N. H1 L; G8 Ounchanged. Surprisingly, the pubic hair almost com-0 C# u z$ O9 O; Y5 o4 x7 M
pletely disappeared except for a few vellous hairs at( ^" E" Z' j$ W# B( T
the base of the phallus. Testicular volume was still 2 b7 H9 ]0 m& G* d& E
mL, and the size of the penis remained unchanged.9 W# r6 U6 G2 j2 G& s, ~
The mother also said that the boy was no longer hav-
9 z# U- L4 Y! E( Y/ o+ z" Aing frequent erections.$ o% P1 v6 {5 m3 `/ P- ^6 Z7 B
Both parents were again questioned about use of
. R/ i1 ^0 ?9 many ointment/creams that they may have applied to
' K- d& {0 C2 C! g: I% K! Hthe child’s skin. This time the father admitted the# \0 n3 ^9 M! H% O6 {7 |! }
Topical Testosterone Exposure / Bhowmick et al 5415 l2 w) y: z8 ~
use of testosterone gel twice daily that he was apply-
, ], o( a9 O, s& g* Eing over his own shoulders, chest, and back area for/ e* J( X" L* k4 }
a year. The father also revealed he was embarrassed. Z2 j: b* I1 `2 c5 t3 U) K
to disclose that he was using a testosterone gel pre-
: _8 i. \0 N$ I) z. ^, A/ X$ Yscribed by his family physician for decreased libido( U6 @8 ?- q( l" l4 n
secondary to depression.
1 V1 y! C" U3 i4 X' }" lThe child slept in the same bed with parents.
8 a' Y4 }0 g2 A2 J: dThe father would hug the baby and hold him on his
" _1 q. Q, G& Hchest for a considerable period of time, causing sig-- F; D& Q$ W6 y( w6 ~; ^
nificant bare skin contact between baby and father.) o$ b% [9 i( H4 n' ^' i/ g
The father also admitted that after the phone call,
, C! u x! l& P( J b- z0 Lwhen he learned the testosterone level in the baby
0 G) K3 L& l. U2 f' w/ \; Fwas high, he then read the product information
- a, n9 h# t5 ~- mpacket and concluded that it was most likely the rea-1 I/ c+ m( n- t+ O) K7 d& \' o
son for the child’s virilization. At that time, they& W& P' j& q ?3 J0 X @8 ?5 w
decided to put the baby in a separate bed, and the4 u. j% \) J, G' _3 X: z
father was not hugging him with bare skin and had) ?2 I9 P9 Z. s F$ R
been using protective clothing. A repeat testosterone1 \6 V5 O1 D1 H3 p, m3 R! z& ^
test was ordered, but the family did not go to the: y; H( r0 k0 z5 L
laboratory to obtain the test.
# h# y- z$ ?! Y Q$ Q& r4 d& GDiscussion6 d, u" | d' a6 u2 O$ F
Precocious puberty in boys is defined as secondary
6 v) J! h9 p8 P( Hsexual development before 9 years of age.1,4
$ _6 o Z5 w& E' j1 iPrecocious puberty is termed as central (true) when" V: A6 X) Q. u4 K3 Z- B
it is caused by the premature activation of hypo-
; i% v4 l5 X; m0 Z8 m( n8 kthalamic pituitary gonadal axis. CPP is more com- n1 L8 S9 n! m! Q B. P. r
mon in girls than in boys.1,3 Most boys with CPP
! \: `, f6 L+ Z( {2 G$ q* pmay have a central nervous system lesion that is, U6 F/ w7 @+ U
responsible for the early activation of the hypothal-% p0 ^7 B4 a: P( p( T- y
amic pituitary gonadal axis.1-3 Thus, greater empha-0 ]1 s3 H0 h+ G0 Q _
sis has been given to neuroradiologic imaging in4 k& \( G& ~2 q5 A9 I9 V
boys with precocious puberty. In addition to viril-
! J: g; R3 k% s$ c9 gization, the clinical hallmark of CPP is the symmet-1 q7 t0 j' v1 O8 ~* u
rical testicular growth secondary to stimulation by7 t! J( \0 h: z* x
gonadotropins.1,3+ D0 y( L, h$ ?9 {$ d- E
Gonadotropin-independent peripheral preco-( B$ O- y+ X4 D# V0 y' L
cious puberty in boys also results from inappropriate
1 G3 o$ O5 D) W# z5 H8 m6 yandrogenic stimulation from either endogenous or( c% x' c0 b" B! e
exogenous sources, nonpituitary gonadotropin stim-, W+ W- g: v3 l8 _9 u: M0 s
ulation, and rare activating mutations.3 Virilizing5 C( _+ K7 q9 g0 {: y- N
congenital adrenal hyperplasia producing excessive
' V9 H1 \3 g- {/ F6 X$ e `/ Aadrenal androgens is a common cause of precocious
@: `) u$ h8 Z5 }8 L m9 npuberty in boys.3,4; W" O( m9 ^2 }& d: k
The most common form of congenital adrenal
- V0 F" u+ ?5 f+ q$ g! d# \hyperplasia is the 21-hydroxylase enzyme deficiency.. {- v5 F$ W6 n N6 k0 d2 l& s
The 11-β hydroxylase deficiency may also result in ]; T- }, Z$ I7 b$ K& m4 t
excessive adrenal androgen production, and rarely,+ [. H4 l; L& ~$ K( z5 W( `7 z' f
an adrenal tumor may also cause adrenal androgen0 A4 d4 M8 f0 k
excess.1,3
6 K/ [( X) x8 qat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
; |$ K; k$ @, R9 F9 m ? J542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
5 \" E7 Y9 r- m( zA unique entity of male-limited gonadotropin-9 T+ u* x! _6 U5 s0 j- F/ g4 @! ?0 T$ F
independent precocious puberty, which is also known
; w5 R; P f& v0 p4 W+ \as testotoxicosis, may cause precocious puberty at a, m$ N. F" {' y
very young age. The physical findings in these boys6 @" {9 l+ ^: X3 p- j. e1 y+ i Y d
with this disorder are full pubertal development, g" l* ?9 t4 |9 M/ |7 ]' X. i; N
including bilateral testicular growth, similar to boys8 N" ^/ _4 A% G
with CPP. The gonadotropin levels in this disorder2 C# r' b0 M/ V5 g. ~
are suppressed to prepubertal levels and do not show& d- l t/ _# b1 _# B
pubertal response of gonadotropin after gonadotropin-
$ Z* x' m# I' g5 l6 Y, [8 @, ureleasing hormone stimulation. This is a sex-linked
' ~ O0 |0 Y) S* p" n% wautosomal dominant disorder that affects only; f* D9 z/ Z4 ~: u9 r: n
males; therefore, other male members of the family8 l, q. D9 M: d% [( S
may have similar precocious puberty.33 P* W: J& f# s' o
In our patient, physical examination was incon-
% c: n) B s% A0 ]! V% {) [sistent with true precocious puberty since his testi-
; U4 H2 f: w. w% `$ F+ ncles were prepubertal in size. However, testotoxicosis
: o1 s C+ n% X7 P6 F* Nwas in the differential diagnosis because his father0 l" K3 O4 E- }$ E3 Q5 l( T
started puberty somewhat early, and occasionally,
) d- a4 b2 d& {4 o' j8 C( p5 l$ Btesticular enlargement is not that evident in the- G4 \7 i9 K0 x S+ l
beginning of this process.1 In the absence of a neg-
! `: {( ]4 ]! |2 Z/ ^ative initial history of androgen exposure, our
6 m% I0 n5 v+ |8 Z$ ~8 I% ?2 zbiggest concern was virilizing adrenal hyperplasia,; I V/ w- J; V; V7 P
either 21-hydroxylase deficiency or 11-β hydroxylase3 J( ?' G# j+ h( @7 s, F) y, P) S
deficiency. Those diagnoses were excluded by find- ]5 j6 e8 K& g; ^. V2 J7 Z: ]
ing the normal level of adrenal steroids.
' `! D( X: F6 h* sThe diagnosis of exogenous androgens was strongly
9 r' W/ g$ D+ @& q! y, e b: Xsuspected in a follow-up visit after 4 months because
2 z9 F+ e5 j* ^1 Athe physical examination revealed the complete disap-+ m. u, o) ^8 U. V4 [% X! A4 j
pearance of pubic hair, normal growth velocity, and/ ^. Q$ ]- w- Y, [* N
decreased erections. The father admitted using a testos-' C& v6 [- j- u$ S* _
terone gel, which he concealed at first visit. He was
- i4 S7 \$ A6 y7 ?2 Susing it rather frequently, twice a day. The Physicians’
5 K8 {1 i o+ L# |+ r A" P6 |Desk Reference, or package insert of this product, gel or
" f0 F* q! c2 s7 j( ?. `7 \cream, cautions about dermal testosterone transfer to
7 v0 Q+ Y- O) D; iunprotected females through direct skin exposure." v. i& b4 _" P) S5 e
Serum testosterone level was found to be 2 times the
! y( z/ u7 V+ v9 o0 }baseline value in those females who were exposed to( w6 p) t$ f& X: G1 B; I
even 15 minutes of direct skin contact with their male
- C& R; A7 S7 R% u4 lpartners.6 However, when a shirt covered the applica-
. V7 H: ]1 @1 gtion site, this testosterone transfer was prevented.
7 l3 L/ M1 `5 cOur patient’s testosterone level was 60 ng/mL,
) P3 \ B1 [9 e; s) g8 }which was clearly high. Some studies suggest that# Q2 u! B2 ^: T) C* N0 p
dermal conversion of testosterone to dihydrotestos-9 r. D* p8 O, d$ ^# B( S
terone, which is a more potent metabolite, is more1 n6 b z, V, ? i; m/ q# }
active in young children exposed to testosterone5 v' F3 ~8 I9 {8 E: c4 T+ W; ~0 ?
exogenously7; however, we did not measure a dihy-' @9 l. x: U0 e P( W# A
drotestosterone level in our patient. In addition to7 S3 H+ a4 i" U- _2 D
virilization, exposure to exogenous testosterone in
8 \( A+ e- F8 ~7 V3 F. ~' r8 Nchildren results in an increase in growth velocity and$ i7 n( Y% D4 O: t. b
advanced bone age, as seen in our patient.
( }2 {4 R/ N, Q1 sThe long-term effect of androgen exposure during
. W0 j2 L0 u9 ]0 Y& H& c; l. zearly childhood on pubertal development and final
! y1 o. u2 ^: p8 Badult height are not fully known and always remain! e- B( N4 [* k! i
a concern. Children treated with short-term testos-3 P& w3 m3 [6 ?
terone injection or topical androgen may exhibit some
( W. o3 Z# w. {: `acceleration of the skeletal maturation; however, after
1 x; Z+ a3 I' k2 U9 i, qcessation of treatment, the rate of bone maturation
# c* d! l: _. d3 P6 y. q/ @, jdecelerates and gradually returns to normal.8,9' K" j! P6 Z" @* x" f
There are conflicting reports and controversy
+ w6 x3 ]% T8 }$ Q0 t* Y& t. kover the effect of early androgen exposure on adult4 G7 M0 @+ z- r3 @; h" r
penile length.10,11 Some reports suggest subnormal+ l; M$ x( C6 u
adult penile length, apparently because of downreg-# G8 G- ]9 j- s* s
ulation of androgen receptor number.10,12 However,
3 } H# j( C* r5 k. vSutherland et al13 did not find a correlation between5 C& {6 `$ Z% W a5 p
childhood testosterone exposure and reduced adult
% I6 G6 U7 O+ P ?penile length in clinical studies.
- K* p$ d w+ h( ^Nonetheless, we do not believe our patient is4 P& z* k: k( g4 c
going to experience any of the untoward effects from) [" D8 j" J- e; J; }3 x1 a" f# E1 A
testosterone exposure as mentioned earlier because
4 b3 K' T6 z5 J2 q) M2 Athe exposure was not for a prolonged period of time.
8 m3 |/ P1 f' C7 F3 `, s. rAlthough the bone age was advanced at the time of; o& n! u( |- |* Y8 v- l; C# [1 {+ }, ?
diagnosis, the child had a normal growth velocity at
a! h( o" ?/ C' athe follow-up visit. It is hoped that his final adult! e6 D3 N7 A: D" W3 M
height will not be affected.
( O8 V$ M- x$ J4 P, x" A: oAlthough rarely reported, the widespread avail-
3 ^; v7 q# M$ Y, E5 ~ability of androgen products in our society may
; y; y" g. U* m! R- t/ v- q2 Jindeed cause more virilization in male or female
& x0 g9 c7 q. X' m6 k" S6 nchildren than one would realize. Exposure to andro-" Q. |& `& O6 `4 D
gen products must be considered and specific ques-
" w [) n, q; o; I# s. C7 Ttioning about the use of a testosterone product or3 }& k/ m: w# @$ m; A% d( z
gel should be asked of the family members during
/ p% E6 Q, W7 fthe evaluation of any children who present with vir-
( U4 W6 J6 k- y! ]0 M; v% b: Yilization or peripheral precocious puberty. The diag-- e& _# X, f; @# D: h
nosis can be established by just a few tests and by% f9 J* P& U% o1 ~
appropriate history. The inability to obtain such a
6 C/ G& \% R; Q, [) u V/ k9 hhistory, or failure to ask the specific questions, may( u! t, S3 K3 F0 |6 B
result in extensive, unnecessary, and expensive
# s2 {% A7 G( c1 U3 t8 Z6 Einvestigation. The primary care physician should be
! t Z; d+ h! ~) N$ maware of this fact, because most of these children0 J3 U( S, ]& |% i) `) n; b
may initially present in their practice. The Physicians’5 u$ m, o g" w+ E& Q, m
Desk Reference and package insert should also put a$ @8 f4 ~' A. P+ O
warning about the virilizing effect on a male or1 A8 a7 s- J- m h' T
female child who might come in contact with some-% }1 I5 K% D1 k, }' b: x
one using any of these products.: _) Z3 t1 q0 o- S& U# B' r
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. q3 \9 I5 B$ V+ h1 x2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
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* R) m$ l" N1 d$ @3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.
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# o1 J, Q9 [0 wexposure to testosterone. Pediatrics. 1999;104:e23.
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6. Physicians’ Desk Reference. Androgel 1% testosterone,
4 b4 ^1 `5 N. ]+ _" k9 L) W K/ {Unimed Pharmaceutical Inc. Montvale, NJ: Medical
4 D# i* X5 A4 n* m" y6 _7 iEconomics Company, Inc; 2004:3239-3241.
, f8 c0 B+ T" V0 }7 I- u7. Klugo RC, Cerny JC. Response of micropenis to topical/ D' m$ x! F! ]$ a1 K
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