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is a significant concern for physicians. Central
/ _- c* q9 z. E4 {precocious puberty (CPP), which is mediated H) G6 X( \2 Q: l6 t
through the hypothalamic pituitary gonadal axis, has
i# C5 m! [* b8 ^/ Ka higher incidence of organic central nervous system. Y' ]) n- q" B6 H2 e9 W
lesions in boys.1,2 Virilization in boys, as manifested
) n4 w) Z7 a* ]by enlargement of the penis, development of pubic- ?. U: }8 l# z' }: H' H
hair, and facial acne without enlargement of testi-
2 L6 R/ z3 G$ D- Mcles, suggests peripheral or pseudopuberty.1-3 We
3 y, f. ^6 S2 K" P/ T! ^# r) kreport a 16-month-old boy who presented with the
# e5 r$ ^6 C C7 p2 jenlargement of the phallus and pubic hair develop-8 U3 ~! g" v, h4 J* i
ment without testicular enlargement, which was due
4 P- v+ e. X' a1 ]: c+ Mto the unintentional exposure to androgen gel used by7 r8 z* p4 T& Q4 I" p. ]3 ?
the father. The family initially concealed this infor-
7 J4 I! T& S% J( umation, resulting in an extensive work-up for this5 p, H/ t# J: m
child. Given the widespread and easy availability of
+ Q0 u' p% q7 N" \. Itestosterone gel and cream, we believe this is proba-' X) T* d$ l1 x; X
bly more common than the rare case report in the" R% |0 y: Y8 o% o
literature.4$ c$ y$ N+ r* l: w% m8 ]/ @
Patient Report
, V/ ~) B& l! y8 F4 F+ l/ l4 T0 o2 BA 16-month-old white child was referred to the$ f/ P& ^; K. p, f( Q) D! p% H; P% ^
endocrine clinic by his pediatrician with the concern
2 B, x# o. {# \0 g4 p$ B; jof early sexual development. His mother noticed& T) p* V$ `* J0 z) L4 B/ ?4 k
light colored pubic hair development when he was1 m$ E W' o/ T
From the 1Division of Pediatric Endocrinology, 2University of9 ~9 |. }0 U1 b
South Alabama Medical Center, Mobile, Alabama.
. `% f: L0 A- l- y; V7 j/ aAddress correspondence to: Samar K. Bhowmick, MD, FACE,
: @* @( f- y) i* k5 u1 w, ^Professor of Pediatrics, University of South Alabama, College of
6 v1 ]6 r0 f0 P3 T, C# GMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
" t1 p m y9 A9 r- q5 Y# z- ye-mail: [email protected].& h o- e: \4 ^" D
about 6 to 7 months old, which progressively became
9 @- C- c: V, J/ T! `darker. She was also concerned about the enlarge-
' N9 e& |" |" K- @/ [ment of his penis and frequent erections. The child" Q, I5 S1 k9 ~9 ^$ y1 T* D5 y
was the product of a full-term normal delivery, with. O5 v+ y# s" h
a birth weight of 7 lb 14 oz, and birth length of
- |3 g! t- l7 [' f& M20 inches. He was breast-fed throughout the first year8 G' [* u2 p# n
of life and was still receiving breast milk along with+ K( N" B# A' i' ~
solid food. He had no hospitalizations or surgery,/ Y5 K+ t1 P6 s( G
and his psychosocial and psychomotor development
3 N6 e9 Q" O0 K* K+ M8 W, ~) owas age appropriate.
% D6 T ]& ?( w, ^3 x IThe family history was remarkable for the father,: y/ l! a( }0 ?- S d3 T3 h
who was diagnosed with hypothyroidism at age 16,
: C1 u4 T) h; a" H* p) `; cwhich was treated with thyroxine. The father’s
5 C$ r, H* M* H; k1 t( `6 [! @4 theight was 6 feet, and he went through a somewhat5 ]. x. S( P0 H9 J
early puberty and had stopped growing by age 14.! I) U3 O/ R9 R
The father denied taking any other medication. The
+ n0 ^5 d6 h; ^/ G- p* U vchild’s mother was in good health. Her menarche
5 x, S* d/ w) C9 m9 Y Z% Nwas at 11 years of age, and her height was at 5 feet" ?# T1 n3 X. l3 L7 t0 a1 ^
5 inches. There was no other family history of pre-
2 o( E7 H; o$ b, ?/ [cocious sexual development in the first-degree rela-
- K4 w. v& ^9 J0 g" atives. There were no siblings.' m- W8 S6 m& G- ~1 ^- ^
Physical Examination
& g; s# @% d# _( ^! p, z0 X0 UThe physical examination revealed a very active,
% z3 ~7 \8 r, `+ s! y2 S" L Pplayful, and healthy boy. The vital signs documented6 S, F5 W* V) K, f5 Y
a blood pressure of 85/50 mm Hg, his length was# D0 ]+ _5 m; y0 H8 r! j' _
90 cm (>97th percentile), and his weight was 14.4 kg+ ~" a" Z4 }* C% D+ R, H+ T
(also >97th percentile). The observed yearly growth% Q9 t7 x8 E: q& ~. T6 s
velocity was 30 cm (12 inches). The examination of
" ~" @- ]$ d0 S/ K+ Othe neck revealed no thyroid enlargement.. D1 e, E: v. J5 O/ r
The genitourinary examination was remarkable for- P+ S1 S g A# T' X# t
enlargement of the penis, with a stretched length of
* b* t0 x @* E, j/ Z$ I) X8 cm and a width of 2 cm. The glans penis was very well5 h0 @+ c/ S" A' `# l
developed. The pubic hair was Tanner II, mostly around
; L- w0 R' _4 X1 P9 J540- p( e7 R' \3 o) J# z6 @
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from J, t" p4 z% F2 i3 D7 F' p
the base of the phallus and was dark and curled. The; z; ]6 y" ] D+ y( m
testicular volume was prepubertal at 2 mL each.4 P/ p4 a% k4 d8 j9 z5 j3 y3 b
The skin was moist and smooth and somewhat5 }: o% f) V0 a1 n$ K
oily. No axillary hair was noted. There were no
; m& r! z) [, I4 }abnormal skin pigmentations or café-au-lait spots.' y" y k; F$ K
Neurologic evaluation showed deep tendon reflex 2+; p( l* Q0 q0 h5 ]$ L
bilateral and symmetrical. There was no suggestion
0 C3 G6 O. e9 \( A( G; @of papilledema.
! n" A% ?* ^- u& W4 I) mLaboratory Evaluation, Q% r* Z$ T7 E
The bone age was consistent with 28 months by
1 {: f- Z" v4 d! c9 susing the standard of Greulich and Pyle at a chrono-1 {; t* \. p4 A& L5 J5 a/ {$ [2 C
logic age of 16 months (advanced).5 Chromosomal( O @( C- j1 g; M# B% @
karyotype was 46XY. The thyroid function test1 b) f* o% M1 _- {$ \: S/ x* f
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
+ Z* o7 t( l: [lating hormone level was 1.3 µIU/mL (both normal)., [* b/ Q0 w! ^4 ^- N
The concentrations of serum electrolytes, blood
# s. f7 n8 P7 zurea nitrogen, creatinine, and calcium all were4 _" P6 W7 q6 o' J. O, V
within normal range for his age. The concentration
: o+ {( ^ I! Y3 m1 vof serum 17-hydroxyprogesterone was 16 ng/dL. g P9 W& Q+ g0 e: Z
(normal, 3 to 90 ng/dL), androstenedione was 20/ s6 U+ ^$ ^8 |" G. {. y
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
5 }0 \0 L/ G; _) aterone was 38 ng/dL (normal, 50 to 760 ng/dL),1 \9 k+ i- b: W7 k
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
9 Y7 \+ w& Y6 b2 P8 W" U7 ]49ng/dL), 11-desoxycortisol (specific compound S) \! K Y( q5 P! ?) |5 t/ M" Z
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-" ^6 k) `0 v$ s4 {, i$ l
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
0 m6 S& r# |8 Q/ b/ ^+ a1 Dtestosterone was 60 ng/dL (normal <3 to 10 ng/dL),
9 S0 f& S9 N! K8 F& `1 v+ E$ n( |7 vand β-human chorionic gonadotropin was less than
; Q+ u% H7 w ^. {( O+ l. K5 mIU/mL (normal <5 mIU/mL). Serum follicular
2 G% x6 F8 P+ E3 i M, a8 d! Rstimulating hormone and leuteinizing hormone* i' G& f& m4 ^- b" M1 O
concentrations were less than 0.05 mIU/mL
8 F F B, {! a1 f" s9 U(prepubertal).
- ^5 d4 t' k+ ^& D- p1 vThe parents were notified about the laboratory1 {( v* i: b$ f; L6 J' w
results and were informed that all of the tests were
' T" D& m o4 u0 \2 Gnormal except the testosterone level was high. The
/ e5 h3 Y3 f% ?; u# h4 b0 bfollow-up visit was arranged within a few weeks to
; F8 m" T2 _- O2 W( _4 j2 v" {obtain testicular and abdominal sonograms; how-8 v$ ]' Y% e& g# x! f( x0 i) I
ever, the family did not return for 4 months.9 {- \ v2 m7 B. J8 T7 I
Physical examination at this time revealed that the' Z3 D" n0 o3 [2 g: {& L
child had grown 2.5 cm in 4 months and had gained8 a! c" Y4 [ v. ^
2 kg of weight. Physical examination remained
6 _& D0 h2 F3 ^: d% J5 aunchanged. Surprisingly, the pubic hair almost com-: c8 O1 w; A( S; J
pletely disappeared except for a few vellous hairs at, w" q8 g7 v- o7 R* p+ I0 B
the base of the phallus. Testicular volume was still 26 @- y' z, o3 x3 ?+ k# S" {: C7 w
mL, and the size of the penis remained unchanged.( s: e3 D8 j1 U2 n
The mother also said that the boy was no longer hav-; {7 l; w, K' u1 K
ing frequent erections.6 e. F; q+ L+ P
Both parents were again questioned about use of* v4 d* A; g E
any ointment/creams that they may have applied to5 \! P' w( f+ r5 b6 c% V) ?
the child’s skin. This time the father admitted the7 R, W5 Z# b$ ]; ?' N
Topical Testosterone Exposure / Bhowmick et al 541. A9 i, B, b+ g" z) W n' G U: X4 r
use of testosterone gel twice daily that he was apply-
) w! P% l0 t+ K8 o; n2 Aing over his own shoulders, chest, and back area for
8 B3 Y0 w8 r; C M; i4 |1 da year. The father also revealed he was embarrassed
: f8 h1 `) T: d4 d& e1 a/ [$ t& Z* Kto disclose that he was using a testosterone gel pre-4 z& }# q2 \6 P a4 D' H' C( S
scribed by his family physician for decreased libido5 q' i% h% L! q$ ?( E9 `+ l, o4 `/ }2 O
secondary to depression.1 c' m- a- a# K$ Q. d
The child slept in the same bed with parents.
/ t' m& M# w% gThe father would hug the baby and hold him on his
$ {- z5 H ?9 u; \2 h* [) vchest for a considerable period of time, causing sig-* ?' G: ~/ h: d- |' L5 u
nificant bare skin contact between baby and father.
3 x' m, H- y. f& p% q" PThe father also admitted that after the phone call,
, G; A. g$ n X( lwhen he learned the testosterone level in the baby* W5 z: F! ^# u, L) v0 K
was high, he then read the product information6 ]2 L2 ~* a6 b( ]5 x2 m
packet and concluded that it was most likely the rea-
( ~. M, M5 L9 Q! `- mson for the child’s virilization. At that time, they' W1 c1 T! n+ c4 v* p) v
decided to put the baby in a separate bed, and the
. l) H, k/ v$ |7 V0 jfather was not hugging him with bare skin and had
" D7 E$ _; D3 |: V. d/ i( R4 tbeen using protective clothing. A repeat testosterone3 s# `3 K B% j; X+ @1 r
test was ordered, but the family did not go to the
/ Y$ F: y8 u4 C! Z3 I2 hlaboratory to obtain the test.
$ l- x9 n! S% r4 C: i4 ^5 ~Discussion
( j3 c0 ^' X' S5 D _" q. dPrecocious puberty in boys is defined as secondary3 k+ ^9 e1 f" D- X# B
sexual development before 9 years of age.1,47 ?3 ~; V$ t+ k; i3 Y, A, v
Precocious puberty is termed as central (true) when) ]# N) f$ d# a* H8 Q5 [$ K
it is caused by the premature activation of hypo-
0 L1 k% O( s7 T# p7 M. h1 Uthalamic pituitary gonadal axis. CPP is more com-% [& V: l, A) }( W& R# S: T2 }$ Z
mon in girls than in boys.1,3 Most boys with CPP
, o. F3 h! ~3 t$ L0 hmay have a central nervous system lesion that is
H- W2 U5 b! |% P# vresponsible for the early activation of the hypothal-
+ W. ?2 P; S) j% u! M0 f% k8 ]amic pituitary gonadal axis.1-3 Thus, greater empha-6 l9 W! r) _( M
sis has been given to neuroradiologic imaging in1 Z; B. ^. K/ t0 M
boys with precocious puberty. In addition to viril-
: `9 P8 b2 S! w! A2 H/ ~9 w3 `ization, the clinical hallmark of CPP is the symmet-
" y4 t0 | j8 C8 A- w$ j6 Z4 Yrical testicular growth secondary to stimulation by- l" q |, V" I! U6 d+ C9 w, ^
gonadotropins.1,36 a) [( I O8 X5 T
Gonadotropin-independent peripheral preco-
8 a2 e% h( D7 ?6 B; X Ucious puberty in boys also results from inappropriate! ?7 S4 z4 ^3 v* t7 @. p
androgenic stimulation from either endogenous or
6 y5 [- ]. ?1 v" I/ Zexogenous sources, nonpituitary gonadotropin stim-& J6 N$ p( I; V6 n; e/ Y' N1 Q8 l
ulation, and rare activating mutations.3 Virilizing+ l1 m* [% g0 J2 f; _4 L
congenital adrenal hyperplasia producing excessive
# j9 e$ s. ]) @( |2 G- xadrenal androgens is a common cause of precocious1 ]9 ?% y4 V; D. g9 p, ?
puberty in boys.3,4
" D- t- _0 x( K( p! F' i. `The most common form of congenital adrenal
2 E5 q- h/ q' A, E( S, M8 Q: whyperplasia is the 21-hydroxylase enzyme deficiency.
; G: t6 |' r2 j2 C! P eThe 11-β hydroxylase deficiency may also result in4 ?8 D3 i0 s9 k! B. w. g& p( I0 @9 r
excessive adrenal androgen production, and rarely," v! C( e9 f$ }% C3 S- X6 ? p
an adrenal tumor may also cause adrenal androgen
: e+ v1 F1 M0 ?/ D# P qexcess.1,3
' v! T" G- b4 A4 U- q t( K# xat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from7 O+ k k" G" g: _+ E, i5 {( g( ?
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
& e' `* V* H, GA unique entity of male-limited gonadotropin-; V3 J: m J4 {& j
independent precocious puberty, which is also known4 C, X( x" H( d- {' Z
as testotoxicosis, may cause precocious puberty at a
, X3 C8 ?2 m7 O. d: z [very young age. The physical findings in these boys/ T+ i, Q/ W' {9 q) A
with this disorder are full pubertal development,
) o4 k" @" S- F3 ?. @1 _including bilateral testicular growth, similar to boys1 ^* d# u0 x0 D2 B/ K+ Q9 Z; [
with CPP. The gonadotropin levels in this disorder
4 I' P$ F" \& I$ N/ T" rare suppressed to prepubertal levels and do not show
! ~4 f% h5 T/ r0 s" Q* Gpubertal response of gonadotropin after gonadotropin-8 Z9 G8 f6 i3 W7 D8 d
releasing hormone stimulation. This is a sex-linked
9 f" ^" p1 b% K( a6 Bautosomal dominant disorder that affects only( B8 v8 d7 m( m; d' f2 o
males; therefore, other male members of the family5 i$ X9 H2 j; B/ k/ b
may have similar precocious puberty.3
. j s& K3 L' t; F/ I7 pIn our patient, physical examination was incon-
* i9 J$ ?, A% s$ q" B- A! O( t- Q# psistent with true precocious puberty since his testi-
' J# p$ s7 i8 p( m) ]: mcles were prepubertal in size. However, testotoxicosis
$ _2 `' \/ r. @: d; J: Cwas in the differential diagnosis because his father4 I0 ?) A. W8 {1 d
started puberty somewhat early, and occasionally,
5 i+ z4 p8 E6 s* @# g& d0 u4 p3 Ltesticular enlargement is not that evident in the
. l% P3 E) P6 e& J( d+ l' \* V3 gbeginning of this process.1 In the absence of a neg-) q& c/ R i: z- y
ative initial history of androgen exposure, our
: o$ t. G8 f$ @' Wbiggest concern was virilizing adrenal hyperplasia,
! u( I9 W9 i- q$ e9 Meither 21-hydroxylase deficiency or 11-β hydroxylase- Y v" h* ?9 g6 x5 g5 z
deficiency. Those diagnoses were excluded by find-
' a8 O9 P6 K% q1 o+ G! Ring the normal level of adrenal steroids." J: [) h' v, W; g, B
The diagnosis of exogenous androgens was strongly
. \- P: P6 y7 ^suspected in a follow-up visit after 4 months because* a& D7 [# @) w) H( q- ^
the physical examination revealed the complete disap-
) V4 r9 `! i: ?pearance of pubic hair, normal growth velocity, and* \* q. z& c8 H
decreased erections. The father admitted using a testos-
: A3 K. F X# D# [* jterone gel, which he concealed at first visit. He was
8 t" ]% n1 M$ w9 P! [; }using it rather frequently, twice a day. The Physicians’6 K, B8 Y5 x$ M1 W
Desk Reference, or package insert of this product, gel or
& B: p; f5 ]5 Ycream, cautions about dermal testosterone transfer to' S' W: Q n3 E, v- d% l7 v
unprotected females through direct skin exposure.- y, O( D( i3 h$ f
Serum testosterone level was found to be 2 times the
$ A" `3 i! I" m2 ^baseline value in those females who were exposed to% O2 h' S$ X8 u q
even 15 minutes of direct skin contact with their male0 N, x4 M) J9 @8 c
partners.6 However, when a shirt covered the applica-5 d& M& h+ q/ P1 Z
tion site, this testosterone transfer was prevented.. }' _* P$ x& b5 E) v
Our patient’s testosterone level was 60 ng/mL,/ N9 N" @; |" o( p6 P3 @* D
which was clearly high. Some studies suggest that6 p7 N1 ?" k) e6 V' }9 O) B: P4 f5 _
dermal conversion of testosterone to dihydrotestos-; \* A' V" H8 I; f: U; t/ ^
terone, which is a more potent metabolite, is more
* z, p: P' c$ k! ?4 F* P bactive in young children exposed to testosterone7 Y- r7 U% _4 b& h/ l
exogenously7; however, we did not measure a dihy-
6 W* W! s) u, g6 h2 g, idrotestosterone level in our patient. In addition to
& j6 g$ O7 c0 {0 rvirilization, exposure to exogenous testosterone in/ L& L* L3 Z) q* z8 i& n3 h# }4 g* C
children results in an increase in growth velocity and
5 W: f. R0 c8 N2 D0 sadvanced bone age, as seen in our patient.' v& C4 W, ~- o! n7 b6 i
The long-term effect of androgen exposure during
2 p, c! W0 C' M3 M0 p, Y5 ~early childhood on pubertal development and final
$ B. S4 b F8 n8 Radult height are not fully known and always remain
$ m8 L( t% b7 e9 G4 k' M1 r. A9 t+ Da concern. Children treated with short-term testos-
1 ~5 I3 j5 M' I: j$ H% \terone injection or topical androgen may exhibit some5 C) G% q0 F! f' W
acceleration of the skeletal maturation; however, after
* d' m2 f3 X7 S9 ]! `cessation of treatment, the rate of bone maturation F# F5 M2 A- m& r% o; W4 c( N) {
decelerates and gradually returns to normal.8,90 Y+ T0 V3 M4 A; K
There are conflicting reports and controversy Q0 _9 V" S ^$ w% F
over the effect of early androgen exposure on adult
( A* H9 u1 t& a- T, qpenile length.10,11 Some reports suggest subnormal
1 e9 q5 W2 Z" ?7 _. k1 K' j0 radult penile length, apparently because of downreg-
* x5 x( A- t% p, ~2 D7 Uulation of androgen receptor number.10,12 However,
& y1 P; X$ a" MSutherland et al13 did not find a correlation between2 Q! e& O; j" l- [
childhood testosterone exposure and reduced adult% i+ b* \. [. ^ R+ Y V3 q
penile length in clinical studies.2 M- n; E+ g* D* [
Nonetheless, we do not believe our patient is& S) X! `4 j8 f+ c R( j3 l
going to experience any of the untoward effects from
4 `; L) X; W7 F! ?# s- K& Ttestosterone exposure as mentioned earlier because
" A5 a/ `7 ?8 v. L0 hthe exposure was not for a prolonged period of time.
& K, Q2 V, U' E$ f' SAlthough the bone age was advanced at the time of8 Y: f; U. @1 [9 c0 U
diagnosis, the child had a normal growth velocity at! {) {2 t# e" Z) s, H: k% ]
the follow-up visit. It is hoped that his final adult( [$ [; ~; d3 n# v. [3 N0 y
height will not be affected.
, l6 |) X: Z @- _8 L- }) dAlthough rarely reported, the widespread avail-4 U$ a' E2 A( V! k z, b
ability of androgen products in our society may
. X5 n; T5 ^: Q* j+ E# [5 Mindeed cause more virilization in male or female
+ H7 N% S% f0 E' v. Hchildren than one would realize. Exposure to andro-
9 z `6 c- }+ r% Q& o% ~8 Hgen products must be considered and specific ques-2 a' Z4 [" ~# f V$ ]
tioning about the use of a testosterone product or3 n( c7 `# `4 V/ C
gel should be asked of the family members during/ _# B+ q/ p. `% H8 J1 \
the evaluation of any children who present with vir-
/ y, F8 k8 q* O" |ilization or peripheral precocious puberty. The diag-$ S7 w5 U9 z; _7 y) r1 Q9 d$ H9 D
nosis can be established by just a few tests and by
* I' p3 ]7 ~! \5 M( F5 T* ~7 `. bappropriate history. The inability to obtain such a
& K8 a7 ?& W+ r+ p2 xhistory, or failure to ask the specific questions, may
" H6 B4 i0 q5 o7 i' |result in extensive, unnecessary, and expensive' E( s) _) L, h- {4 m
investigation. The primary care physician should be. F, ]5 m7 d j' {! n
aware of this fact, because most of these children0 ]0 q& |# }; A4 ^
may initially present in their practice. The Physicians’ m ?& j% f6 @! X2 d: p) V; X
Desk Reference and package insert should also put a
3 R- u5 j, {& Wwarning about the virilizing effect on a male or
; I! K6 ]7 r5 m ? s) x/ Ifemale child who might come in contact with some-
$ q/ q1 J: w0 ^4 p1 z8 Z$ ]one using any of these products.* w- v$ m- B) _$ T$ Q9 }" @
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2002: 565-628.0 }# u4 f2 H) p
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious/ {" V4 W5 j* j) {6 T% C
puberty in children with tumours of the suprasellar pineal3 x( c" ^0 R1 p
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; T8 B5 Z- G3 p* h& H# T: ?4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual! [3 s- }3 d! ~ s s
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" T3 U! S) H3 }! T8 _2 r5. Greulich WW, Pyle SI, eds. Radiographic Atlas of
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0 k; L4 G; g0 j1 J: @$ Q; UStanford, CA: Stanford University Press; 1959.
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Unimed Pharmaceutical Inc. Montvale, NJ: Medical! D$ ~: h' o# |# Q4 y2 [* `) I3 _
Economics Company, Inc; 2004:3239-3241.* g4 @& q# g' K" i; I1 I: m: y
7. Klugo RC, Cerny JC. Response of micropenis to topical
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