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is a significant concern for physicians. Central. l* O7 I/ s8 h0 r; G' Z# E: P
precocious puberty (CPP), which is mediated8 e8 V4 Y0 I3 h9 g/ D; t
through the hypothalamic pituitary gonadal axis, has
4 W# f# ^: I5 M6 p% B7 C+ |% Qa higher incidence of organic central nervous system! K. O0 o- ?5 I" s( g0 M
lesions in boys.1,2 Virilization in boys, as manifested. V- V; M9 o: a' P# m
by enlargement of the penis, development of pubic; u2 b/ c- Q+ ?) X6 ~8 C7 }$ T
hair, and facial acne without enlargement of testi-
D- T7 k: q! Lcles, suggests peripheral or pseudopuberty.1-3 We8 ^$ j: J- _3 M6 O4 @
report a 16-month-old boy who presented with the) E, @( K* d4 F1 j
enlargement of the phallus and pubic hair develop-
! w& P. i$ n" c4 E4 d! E7 Qment without testicular enlargement, which was due
# P! R" I+ A! a! N0 Uto the unintentional exposure to androgen gel used by& D- m3 J' f+ s- u( {) ]% J+ u: I
the father. The family initially concealed this infor-
t. o' r+ |( `/ R3 ?5 {mation, resulting in an extensive work-up for this: [$ {4 V9 T) ] o2 X- }9 |
child. Given the widespread and easy availability of
; A3 X2 W# N2 V, T5 Ytestosterone gel and cream, we believe this is proba-* h; b3 _0 q& ]6 n1 T
bly more common than the rare case report in the/ I5 F) |& l# q& I) R) G) U8 i
literature.4
. v3 j+ F6 Z6 O' @ FPatient Report9 E- x Y9 |5 e5 k
A 16-month-old white child was referred to the
n9 v& T) q) s8 Uendocrine clinic by his pediatrician with the concern
& A' w0 r5 a* A5 q6 @3 M1 G/ L, E" Yof early sexual development. His mother noticed
* n3 T. S$ p! ^! \( O& Clight colored pubic hair development when he was
" j( }$ f% |7 _8 E1 H5 L5 yFrom the 1Division of Pediatric Endocrinology, 2University of
, T% R1 u* S9 {3 bSouth Alabama Medical Center, Mobile, Alabama.& C( L7 L0 z- c) I$ k6 m6 O, W
Address correspondence to: Samar K. Bhowmick, MD, FACE,
$ v$ h* Z" F; Z/ _2 yProfessor of Pediatrics, University of South Alabama, College of
" ]+ }* D; n5 j* \+ J0 f( z5 T. gMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
6 ]# y- _" C! X9 V9 R- s! E0 N2 ?e-mail: [email protected].
3 A# N$ I x5 [$ Q& Y* Babout 6 to 7 months old, which progressively became
* p T. C6 o/ x1 s4 zdarker. She was also concerned about the enlarge-' F% F" Y f$ B1 E2 G1 k
ment of his penis and frequent erections. The child
' z0 ~; {% F0 Y; ~: c' @was the product of a full-term normal delivery, with7 F9 q4 S0 i- n) T3 E
a birth weight of 7 lb 14 oz, and birth length of
( G, z. O/ ?: Z7 i20 inches. He was breast-fed throughout the first year: l2 F9 N: E. o
of life and was still receiving breast milk along with& w, q( O# N! ]3 t3 Q; W
solid food. He had no hospitalizations or surgery,0 \8 d* l. y; x7 z2 a: B
and his psychosocial and psychomotor development
9 c3 W# f8 n; ?/ t7 ]was age appropriate.
6 m" S* q: B; v* \, A" f8 o hThe family history was remarkable for the father,
; `5 t t6 I' D) a- lwho was diagnosed with hypothyroidism at age 16,
; d5 a1 i5 y1 C% @# W4 O5 Hwhich was treated with thyroxine. The father’s
& v) A, c& o% B) g( B7 jheight was 6 feet, and he went through a somewhat2 b, |3 H( M. H
early puberty and had stopped growing by age 14.
$ E$ h6 x. u: W5 QThe father denied taking any other medication. The
0 k. u# U% y4 C0 x7 ?) T5 {2 Z( p0 Ichild’s mother was in good health. Her menarche, F4 P& f0 q0 [- J$ [
was at 11 years of age, and her height was at 5 feet3 L2 A; k) c! u. ~+ b
5 inches. There was no other family history of pre-( p& `. q7 G& v8 _
cocious sexual development in the first-degree rela-4 M9 K$ h1 y7 M
tives. There were no siblings.3 e& `4 ~% N+ @+ ^& q( u
Physical Examination
I/ b/ ~- _) m, i& uThe physical examination revealed a very active,
4 b, [" ]3 i+ Y: `playful, and healthy boy. The vital signs documented
/ n& Q$ s( D5 Z6 J' C' O9 n6 ca blood pressure of 85/50 mm Hg, his length was
x; m$ p% _) O+ }90 cm (>97th percentile), and his weight was 14.4 kg7 T. n- B0 m# R' n) ~8 ?
(also >97th percentile). The observed yearly growth# I" ^( k( J: Y3 s0 ?
velocity was 30 cm (12 inches). The examination of
( ~/ O! v7 r" G4 H1 F) Jthe neck revealed no thyroid enlargement.
: L' { |- r+ m2 ]4 w2 BThe genitourinary examination was remarkable for$ p# h# k9 b. b) A1 \# G7 \
enlargement of the penis, with a stretched length of
* R" p$ e% b, }8 cm and a width of 2 cm. The glans penis was very well1 D: R0 e- }0 F7 x
developed. The pubic hair was Tanner II, mostly around, E# z) _7 F" ?
540
+ A0 H# P4 ~ p4 vat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
5 ^- n# O6 L+ ~* o+ @& s& k' @; ythe base of the phallus and was dark and curled. The! g8 p" H) v0 f; L8 d% ? C3 o
testicular volume was prepubertal at 2 mL each.: L) c! v9 s3 [. y5 H* A
The skin was moist and smooth and somewhat
! `# m- P& c- r* o' Voily. No axillary hair was noted. There were no
1 g4 f5 ?+ P& H0 X; n5 Dabnormal skin pigmentations or café-au-lait spots.; l& {2 \' }, Q9 k
Neurologic evaluation showed deep tendon reflex 2+& U6 U( t+ q2 X
bilateral and symmetrical. There was no suggestion/ ?7 v( N. R' M+ T1 O, t/ ~" S
of papilledema.
7 U# b3 d/ U# k1 h' X a1 KLaboratory Evaluation
$ |7 g6 u8 {; s/ h. UThe bone age was consistent with 28 months by
0 G- X1 u' y3 d, E7 e- pusing the standard of Greulich and Pyle at a chrono-( N; M4 K& u& _ X
logic age of 16 months (advanced).5 Chromosomal
& Z- K, j7 ]: N+ ~( nkaryotype was 46XY. The thyroid function test5 H( O# v. D ?6 Z
showed a free T4 of 1.69 ng/dL, and thyroid stimu-! z, |& n9 D' }1 J( h0 I
lating hormone level was 1.3 µIU/mL (both normal).
9 @9 O$ t+ O' S e, ?( t$ OThe concentrations of serum electrolytes, blood
" v+ E! t' k( M0 p. t0 _* _urea nitrogen, creatinine, and calcium all were
7 l9 v1 r& S& n; ^' M8 Fwithin normal range for his age. The concentration
P4 E0 I5 P: |7 }% Sof serum 17-hydroxyprogesterone was 16 ng/dL
) k8 @# P7 ], C% m' `3 A: m(normal, 3 to 90 ng/dL), androstenedione was 201 W& z: l, Y3 ~5 i
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-% ~2 R1 u5 z) A" p, c2 [3 L
terone was 38 ng/dL (normal, 50 to 760 ng/dL),! D2 m' t( I4 x9 e7 r, j3 e( `
desoxycorticosterone was 4.3 ng/dL (normal, 7 to: b) Z9 H6 ~ p; N! @7 W
49ng/dL), 11-desoxycortisol (specific compound S)' e) s: h! a- k
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
+ d, z# {7 A# M) q4 D$ k; \tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
+ U+ B1 A0 A: g; d+ Qtestosterone was 60 ng/dL (normal <3 to 10 ng/dL),
/ S" |; v% H" g+ ?and β-human chorionic gonadotropin was less than" Z. M/ Z/ N8 N9 T) j$ W' m
5 mIU/mL (normal <5 mIU/mL). Serum follicular
3 u3 J+ a) L& x I3 H$ Hstimulating hormone and leuteinizing hormone% L4 N; T0 z! ]( ^- w
concentrations were less than 0.05 mIU/mL
1 C# o+ Q$ S; {2 f8 m4 f(prepubertal).
9 \7 p9 V4 o: h* N0 W0 h! HThe parents were notified about the laboratory
; P. X* A6 }& W1 i. presults and were informed that all of the tests were
5 Q8 T2 q0 }7 E5 P j/ Rnormal except the testosterone level was high. The# R8 V3 J3 G' R3 z+ Q" x
follow-up visit was arranged within a few weeks to# }3 h& m6 B' }& v5 k8 \% E p) }
obtain testicular and abdominal sonograms; how-& k" _6 c8 ]% q( N( i7 ^9 E d6 I8 C( M
ever, the family did not return for 4 months.
# f; J7 B/ B6 C8 D/ g. \Physical examination at this time revealed that the" S* u; [& ~) g
child had grown 2.5 cm in 4 months and had gained
- ^8 i0 ~! I# s- `* f' U2 kg of weight. Physical examination remained4 D9 j) I& L# d8 m( h) B
unchanged. Surprisingly, the pubic hair almost com-
& F: O/ d7 p) ]' I" s; Upletely disappeared except for a few vellous hairs at
; W( P9 e1 C% [/ p# Cthe base of the phallus. Testicular volume was still 2
/ U3 b m. @- V2 CmL, and the size of the penis remained unchanged.4 C2 [' b9 U) y4 W
The mother also said that the boy was no longer hav-
6 v1 U0 t/ z( l/ s. H' A, k$ G2 ging frequent erections.+ T, Y) T$ N3 B8 c% R8 P0 m2 \) [
Both parents were again questioned about use of
0 r& ~' l+ D9 j8 A+ p+ V8 Sany ointment/creams that they may have applied to) Z6 I( C: m3 _: _
the child’s skin. This time the father admitted the1 N( L! p7 S8 w% p2 a
Topical Testosterone Exposure / Bhowmick et al 541
D) F$ {1 _' W. \& S$ yuse of testosterone gel twice daily that he was apply-: {, i, i9 _, v+ D, f$ D
ing over his own shoulders, chest, and back area for' G. a2 T" C: j- E) Q) N
a year. The father also revealed he was embarrassed. g' K" N$ K) j2 i, l1 E2 K
to disclose that he was using a testosterone gel pre-
" ]$ T! ]" o7 i! n9 o5 _scribed by his family physician for decreased libido
, q7 z3 g v, b0 tsecondary to depression.
. e/ ]" V! I# y, l9 z8 hThe child slept in the same bed with parents.$ r+ y |" ^& [# I E& A
The father would hug the baby and hold him on his
/ w: f( M1 n% l, D2 r: gchest for a considerable period of time, causing sig-
: r# D& q* L, R% g8 lnificant bare skin contact between baby and father.
+ \$ G1 \' y0 W0 }The father also admitted that after the phone call,
" g) P1 \2 y8 @) dwhen he learned the testosterone level in the baby9 G6 B- {' p* A/ s6 X5 M
was high, he then read the product information: j! M: M1 _7 [# K& M
packet and concluded that it was most likely the rea-! Y1 h& b2 l! E6 S6 Q e
son for the child’s virilization. At that time, they C4 B O0 u9 e( f
decided to put the baby in a separate bed, and the: c5 t+ c; D+ A
father was not hugging him with bare skin and had* W: {$ L# N, X# e8 @. \* @# _' Z/ C
been using protective clothing. A repeat testosterone
3 `- j# |! Q# [4 u, e d% K0 W+ O; _test was ordered, but the family did not go to the
; S" ?( u' f+ z. u Mlaboratory to obtain the test.9 a# r. J4 L2 z6 B# N$ |/ y& R
Discussion$ P G0 T4 E0 O9 f, o
Precocious puberty in boys is defined as secondary" I/ `. f% T* z3 s$ h. u
sexual development before 9 years of age.1,48 Q' K% n& b0 Q9 ~
Precocious puberty is termed as central (true) when
1 N6 a; f7 N% [$ d* @, u$ wit is caused by the premature activation of hypo-9 T L" h/ j! q; ]' B% ^) J* B
thalamic pituitary gonadal axis. CPP is more com-
# X, q; q/ c1 F& n1 Fmon in girls than in boys.1,3 Most boys with CPP! C4 [0 Z5 X" S e
may have a central nervous system lesion that is* \. D8 ?1 S% R, h$ x8 _
responsible for the early activation of the hypothal-+ h, P- `; O6 c5 @7 s
amic pituitary gonadal axis.1-3 Thus, greater empha-( I0 X" _) l# Y( x0 D$ O, i
sis has been given to neuroradiologic imaging in) S' }0 `% g: ~6 x
boys with precocious puberty. In addition to viril-! D( k# y6 Q2 ^+ ?2 ? n3 A6 W
ization, the clinical hallmark of CPP is the symmet-4 ], \ m4 [, v/ d& l$ v
rical testicular growth secondary to stimulation by
3 r* s' K% V/ p2 Y8 Q, \gonadotropins.1,39 C; \( D5 Q" m |9 {3 U$ d
Gonadotropin-independent peripheral preco-1 D5 p+ S# Z7 x5 _% A$ U4 z- ]
cious puberty in boys also results from inappropriate; G( B! c% I3 z6 x3 A$ i
androgenic stimulation from either endogenous or
, C4 j! F, Z( D) fexogenous sources, nonpituitary gonadotropin stim-
: @/ s" ~. Z5 N6 b9 N; W1 ~ulation, and rare activating mutations.3 Virilizing) { C' m7 x8 q. O
congenital adrenal hyperplasia producing excessive
. F E0 ?9 P; g& c, _1 }- }& y7 Madrenal androgens is a common cause of precocious k* ^1 {/ y5 A
puberty in boys.3,4
]7 f# D' R6 C6 p1 ~: I/ U; W: cThe most common form of congenital adrenal/ t( r) j( V9 e/ E. ^5 m+ g% |, j6 O
hyperplasia is the 21-hydroxylase enzyme deficiency.5 b) M. z9 R7 l- \$ v- A6 k
The 11-β hydroxylase deficiency may also result in
) u; J# g6 a+ i% oexcessive adrenal androgen production, and rarely,
8 j- I8 ] q, v+ zan adrenal tumor may also cause adrenal androgen. {. E& T. v+ |6 p5 \$ q
excess.1,3; c0 C$ P, B) a- R) s
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
0 \ r$ y" i3 Q. I, h542 Clinical Pediatrics / Vol. 46, No. 6, July 2007# P i" ^0 K, M5 h7 M2 v; Q( ]! Y; z
A unique entity of male-limited gonadotropin-
0 ~; M3 }1 }9 g2 s% R i# nindependent precocious puberty, which is also known
/ B$ Y% p/ d6 Gas testotoxicosis, may cause precocious puberty at a
7 v) O: f& I0 R j! cvery young age. The physical findings in these boys
. O- x1 _2 v9 k, p( V9 d1 Y' Jwith this disorder are full pubertal development,
( k' u5 u" n' J' i5 x4 B, r9 yincluding bilateral testicular growth, similar to boys' X1 D! s% ?- S6 v
with CPP. The gonadotropin levels in this disorder3 }. g0 w- u; r7 U/ H
are suppressed to prepubertal levels and do not show
4 s J* H. d. L0 P' u$ n9 _4 \pubertal response of gonadotropin after gonadotropin-- |8 M# D7 d8 Z; ^/ p6 W/ {
releasing hormone stimulation. This is a sex-linked
9 t3 h Y! Q7 f6 @" \autosomal dominant disorder that affects only
J, @$ h' g0 b) Zmales; therefore, other male members of the family4 u1 q3 `: a( ?& c# B; s
may have similar precocious puberty.3
: s) q9 W7 x, A, G! HIn our patient, physical examination was incon-+ o. L6 l7 @; W! H
sistent with true precocious puberty since his testi-
4 c5 V8 G& y5 Y/ z2 i* m/ Lcles were prepubertal in size. However, testotoxicosis
! q% {# F5 k# u T, O% D) `was in the differential diagnosis because his father
$ r/ K* Z7 Z( s3 }- F: p0 C& a) xstarted puberty somewhat early, and occasionally,
1 g$ n5 o l" ?* w* b+ b; k4 ?testicular enlargement is not that evident in the
* T* r5 m6 ?: D% |% C- S1 J/ P4 {beginning of this process.1 In the absence of a neg-
& J, h( D, E% e, z& e Yative initial history of androgen exposure, our
' k4 u8 W% E) Q! i, \9 ?! F& u5 hbiggest concern was virilizing adrenal hyperplasia,0 Q* c% u6 l u' m2 f' C, m
either 21-hydroxylase deficiency or 11-β hydroxylase
' G' ~+ Y3 @: ]0 C8 Xdeficiency. Those diagnoses were excluded by find-
6 Q) i) F4 } E4 ] I1 ]ing the normal level of adrenal steroids.8 s' {5 @+ J3 G
The diagnosis of exogenous androgens was strongly
) X4 @, _& W! d; Wsuspected in a follow-up visit after 4 months because
: p( y9 N5 T1 R1 |" Hthe physical examination revealed the complete disap-
# \1 W* d% r1 |2 D: xpearance of pubic hair, normal growth velocity, and
3 ` u1 Y# \# c* x- H; pdecreased erections. The father admitted using a testos-9 y: N' j" j, \% n6 {
terone gel, which he concealed at first visit. He was- M6 L5 ?! X, a# @- _) j
using it rather frequently, twice a day. The Physicians’
. L3 Z' s$ ~( D8 G+ b, R9 A' CDesk Reference, or package insert of this product, gel or4 c5 M' | w% ^. \, T
cream, cautions about dermal testosterone transfer to; w, z2 `4 H8 C t
unprotected females through direct skin exposure.
* W( Y( k6 @ sSerum testosterone level was found to be 2 times the t' r8 w# [7 L; A7 x3 H* M
baseline value in those females who were exposed to
- M) Y$ x% I3 g! deven 15 minutes of direct skin contact with their male
! z# Q8 [) |1 ?/ Q- P/ Npartners.6 However, when a shirt covered the applica- s' i+ b; V7 M6 J- p- L4 ]
tion site, this testosterone transfer was prevented.
( l& n7 g6 F( `3 s7 IOur patient’s testosterone level was 60 ng/mL,
$ N! R8 y2 b9 Q8 v5 E& W) qwhich was clearly high. Some studies suggest that
5 n! \% S e& U! qdermal conversion of testosterone to dihydrotestos-& X, b* G8 `& P( z
terone, which is a more potent metabolite, is more
, e9 R' O. f& F# ~" Ractive in young children exposed to testosterone( t2 h2 d% B3 [: h
exogenously7; however, we did not measure a dihy-
" Z7 V- f% v* V6 h) ddrotestosterone level in our patient. In addition to h, u* q) i. r2 V5 x& V! o0 J5 l6 p
virilization, exposure to exogenous testosterone in
8 p% V) @4 I3 Z! rchildren results in an increase in growth velocity and
! K9 Y" y( a2 Y5 g$ `advanced bone age, as seen in our patient.
+ M4 u, H# [3 ~2 o/ Y: hThe long-term effect of androgen exposure during
3 c3 a0 _! \1 Gearly childhood on pubertal development and final! V! [8 F. M. _' ~ V7 {+ N
adult height are not fully known and always remain
/ r: V% @& A3 Q6 V4 }a concern. Children treated with short-term testos-
; ~4 {4 Z" F7 U/ q( Gterone injection or topical androgen may exhibit some
3 @2 e: H8 a; c0 s$ \acceleration of the skeletal maturation; however, after
: f5 T* S0 W. J/ xcessation of treatment, the rate of bone maturation
* A) v4 ^4 A/ ^decelerates and gradually returns to normal.8,9, o/ @8 e) E, w" N! D2 g
There are conflicting reports and controversy
2 B* y8 D L; w, Y6 Zover the effect of early androgen exposure on adult5 d$ }( G8 v4 p! ^ u
penile length.10,11 Some reports suggest subnormal
+ X8 b2 u8 s! R S. ]adult penile length, apparently because of downreg-2 ?& f4 B) Q/ P5 H( ?: ^4 p. L
ulation of androgen receptor number.10,12 However,4 N& r- j; e" F# }$ K
Sutherland et al13 did not find a correlation between
, n" `1 h; K: a& W! J$ hchildhood testosterone exposure and reduced adult; u0 N5 }! I1 h' T2 {' N
penile length in clinical studies.
. L" q' P1 K% `0 B' M! XNonetheless, we do not believe our patient is
/ E# }; ?) a/ h1 f3 ~! tgoing to experience any of the untoward effects from
1 M: L( w- S0 T2 d. ~testosterone exposure as mentioned earlier because" I r% {" t# ~; [
the exposure was not for a prolonged period of time.
) L4 Z( n+ b0 n0 _' G3 t0 L& ?Although the bone age was advanced at the time of
+ |$ c- {8 m5 u' zdiagnosis, the child had a normal growth velocity at0 q$ h9 r5 y3 l9 l, n; }/ ^6 S
the follow-up visit. It is hoped that his final adult7 n2 z9 X+ t- G0 r* j6 c
height will not be affected.
9 |( ^ h- a' n2 H; s6 \2 {Although rarely reported, the widespread avail-
) u5 O' r) q4 J; w* m8 j. @ability of androgen products in our society may) G% ]- a* q- h; y/ M9 B2 T, y5 t
indeed cause more virilization in male or female6 p Y$ F n1 N( J D
children than one would realize. Exposure to andro-) ~( u( b( F7 D
gen products must be considered and specific ques-( b* [. ^1 @! a+ I
tioning about the use of a testosterone product or
1 j) p2 x; I4 T7 j2 n6 Y1 Pgel should be asked of the family members during& R. e! l9 z+ _7 M
the evaluation of any children who present with vir-
5 Q. X: a" c3 e$ G: |, g- n5 filization or peripheral precocious puberty. The diag-
4 |: y& M4 Q, D8 P1 Rnosis can be established by just a few tests and by
9 M, E3 {, G. P0 N$ S% m& p/ X# e' Sappropriate history. The inability to obtain such a
2 ~% p$ B% M% o! N" hhistory, or failure to ask the specific questions, may! Q% Z1 a- M6 K' d3 E
result in extensive, unnecessary, and expensive
4 W- R, W+ ^! b; P: T minvestigation. The primary care physician should be
, x9 _3 i1 Y; ]0 d) \aware of this fact, because most of these children. y/ ]4 S' @% C# b9 V+ p& E- i
may initially present in their practice. The Physicians’# v7 f/ z' [* c% u
Desk Reference and package insert should also put a
' m1 X) a& t% h7 V: ~- Pwarning about the virilizing effect on a male or
7 p( a; }: N# ]" B) b. o: ifemale child who might come in contact with some-
- v6 p7 e1 g5 c8 X3 b6 P' oone using any of these products.
5 ~ ^' R# J$ E; IReferences5 y4 {% Y5 y# y, C6 a
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% l) W' w& V" [2 e/ F7 i+ @3 _and puberty in the male. In: Sperling MA, ed. Pediatric
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2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious( A4 j6 Z# q2 f9 g% E- H$ k8 _/ V
puberty in children with tumours of the suprasellar pineal
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3 ^+ @5 @6 x* yexposure to testosterone. Pediatrics. 1999;104:e23.
5 L) q4 U% [9 |; l" g. f1 m, C+ ]5. Greulich WW, Pyle SI, eds. Radiographic Atlas of
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: H1 q2 j. E- }5 g5 `Stanford, CA: Stanford University Press; 1959.
. y! q1 x u3 Q) v6. Physicians’ Desk Reference. Androgel 1% testosterone,
" l' P/ q5 @* h' w* b3 ~Unimed Pharmaceutical Inc. Montvale, NJ: Medical
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7. Klugo RC, Cerny JC. Response of micropenis to topical
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