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is a significant concern for physicians. Central# @1 |, Q9 t2 M h: m5 H7 D
precocious puberty (CPP), which is mediated
& f% v, G3 O/ M; ythrough the hypothalamic pituitary gonadal axis, has/ j: J: @3 x0 @3 i6 Q' t
a higher incidence of organic central nervous system
$ v, c1 z! l0 vlesions in boys.1,2 Virilization in boys, as manifested$ a9 _) [ I+ a' a
by enlargement of the penis, development of pubic( d' G! L/ [7 M; ^" @( O' A# Z0 c
hair, and facial acne without enlargement of testi-2 ^' ~3 ]! |1 K: ?8 a1 b
cles, suggests peripheral or pseudopuberty.1-3 We
0 y5 C7 J/ o% p" v& F9 Mreport a 16-month-old boy who presented with the5 p- U' S7 j$ Y
enlargement of the phallus and pubic hair develop-
. m1 h x- `; Z7 Q/ h# U& ement without testicular enlargement, which was due+ {) T& w9 U9 v; F% X
to the unintentional exposure to androgen gel used by
' R' N( p; ~9 Y' Jthe father. The family initially concealed this infor-
( J4 k2 s2 j5 t! T6 W: k7 Jmation, resulting in an extensive work-up for this
; s3 Z9 C$ z$ Echild. Given the widespread and easy availability of' ?8 A$ y$ U& j+ v1 Z
testosterone gel and cream, we believe this is proba-
# \& P+ j4 x, _- w5 H) x, H9 @bly more common than the rare case report in the
( F# V1 T; O0 j# E2 @. w+ Uliterature.4
- o6 A5 c9 g: t' U. E" JPatient Report
/ e4 Y& M% Q1 n' {, W- S) wA 16-month-old white child was referred to the
2 {1 m( `- |3 D5 Iendocrine clinic by his pediatrician with the concern
& o2 O% s- L8 t- y# ?of early sexual development. His mother noticed
9 F$ w7 f) a# i3 ilight colored pubic hair development when he was
% m, C. k& ~5 A" b5 ~' d3 K% s8 ]From the 1Division of Pediatric Endocrinology, 2University of. O8 ]1 S) J' c0 Z1 S
South Alabama Medical Center, Mobile, Alabama.) z* ~# g- K3 o
Address correspondence to: Samar K. Bhowmick, MD, FACE,( ]( _. E) y& l, j1 R ?/ N
Professor of Pediatrics, University of South Alabama, College of+ |/ \) ?3 e ^& ~
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
5 w& ^+ ? h7 Be-mail: [email protected].! u, E' V- t2 G% ^. i0 j% ^
about 6 to 7 months old, which progressively became
* t! r; g9 l0 rdarker. She was also concerned about the enlarge-# z& D' A0 `; d7 |3 b
ment of his penis and frequent erections. The child( j: A' l* H7 H. w. j" z( m
was the product of a full-term normal delivery, with
2 v0 l# x9 ^$ j* e" m: ~a birth weight of 7 lb 14 oz, and birth length of" V1 B' T& \; C V6 ~
20 inches. He was breast-fed throughout the first year
?: p. f$ S# ~# W# E) ^of life and was still receiving breast milk along with
" H" K/ }1 e0 C1 L' L& [ hsolid food. He had no hospitalizations or surgery,
& o5 Q) R# N+ q3 T) `and his psychosocial and psychomotor development* b# B* o- G& j& |# L" {# I
was age appropriate.+ y, I3 q0 I) Y: |
The family history was remarkable for the father,$ g2 K0 G& b8 s, @# w
who was diagnosed with hypothyroidism at age 16,
4 s% g' }4 x7 ^/ Iwhich was treated with thyroxine. The father’s6 E) \4 M: P f3 \1 I
height was 6 feet, and he went through a somewhat
' k- ?. n8 ^' X! ~1 n$ Eearly puberty and had stopped growing by age 14.
; r1 c" V- {. J4 O% DThe father denied taking any other medication. The: X) C% S, P+ ?+ t
child’s mother was in good health. Her menarche
x0 Y5 o0 f3 D4 vwas at 11 years of age, and her height was at 5 feet
9 k' z, S( W' e/ _5 inches. There was no other family history of pre-: v, B5 G/ B1 R) c' C6 k# q
cocious sexual development in the first-degree rela-! T( }* [1 U- Z4 U9 {' g" b
tives. There were no siblings.; s3 g/ f6 s; K" i
Physical Examination' `+ @* X. x3 s
The physical examination revealed a very active,+ ]/ o8 A8 t! ?
playful, and healthy boy. The vital signs documented% m% S* v+ c/ q6 i" w4 \
a blood pressure of 85/50 mm Hg, his length was9 @. b4 G( J( ~$ s$ s, H: q
90 cm (>97th percentile), and his weight was 14.4 kg
: h6 }( |4 u {3 K(also >97th percentile). The observed yearly growth7 C; H5 w1 G$ t2 g
velocity was 30 cm (12 inches). The examination of& o% S# b$ }% a
the neck revealed no thyroid enlargement.
* u! M! ]) I& b) IThe genitourinary examination was remarkable for
^6 C, a6 N1 ^, X6 }$ r) ~( ~enlargement of the penis, with a stretched length of
7 [' f2 r/ I: I* O+ H5 a8 cm and a width of 2 cm. The glans penis was very well- c- } O" H: K3 z& [
developed. The pubic hair was Tanner II, mostly around, z. j* ]3 j, @
540
a, i( U0 d7 G* I% ]# ~+ m0 E0 [at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from! o: n9 t8 S {
the base of the phallus and was dark and curled. The
0 {. r# K) R& h9 l* `) v5 x$ a- mtesticular volume was prepubertal at 2 mL each.
* w. ?/ y( { a' |# y HThe skin was moist and smooth and somewhat- _& e& y/ H3 J$ A# z. j: _9 ?
oily. No axillary hair was noted. There were no) R6 J8 ]# @# g
abnormal skin pigmentations or café-au-lait spots.
9 Y! i6 Q6 d! ^" ZNeurologic evaluation showed deep tendon reflex 2+; t6 J$ y% M1 t. n: B
bilateral and symmetrical. There was no suggestion
. I, _* B$ ?. W& ^. Z) sof papilledema.2 s/ z) m" \+ ]
Laboratory Evaluation
% W: y0 V; T( V$ IThe bone age was consistent with 28 months by
5 Z* k" d9 ^6 \- H" Rusing the standard of Greulich and Pyle at a chrono-5 U8 v0 ^+ `# {& l' P
logic age of 16 months (advanced).5 Chromosomal
- ]+ r, f8 p( w5 Ikaryotype was 46XY. The thyroid function test
( p, P. e/ A. [showed a free T4 of 1.69 ng/dL, and thyroid stimu-
4 G; e" U" j5 a( J2 L5 Nlating hormone level was 1.3 µIU/mL (both normal).
0 V5 _3 L$ r0 @" @% r# D( E2 E4 R; wThe concentrations of serum electrolytes, blood d% X( i; F5 D4 n! d
urea nitrogen, creatinine, and calcium all were/ q. ?% f- [* } R; C( a
within normal range for his age. The concentration
5 J; E0 w* |: iof serum 17-hydroxyprogesterone was 16 ng/dL
" q" W7 A+ V: [: Z# `+ a ]( L. {0 s(normal, 3 to 90 ng/dL), androstenedione was 20
; Z5 Q( x% D) n/ f4 k$ B) mng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-4 i! H; J6 c" u. B. k
terone was 38 ng/dL (normal, 50 to 760 ng/dL),+ F: u5 r) Q) i8 w: s Y( l! v! E
desoxycorticosterone was 4.3 ng/dL (normal, 7 to6 R$ ?, x* N C! p1 u
49ng/dL), 11-desoxycortisol (specific compound S)
# k* @ x9 k0 ~% P L6 K% L2 Wwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-# L; z. n' i/ F) Y( @0 ]
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total Y7 G; A% H# P; ?; ~1 N
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
" v2 O/ z3 @& l& @3 gand β-human chorionic gonadotropin was less than: g/ `0 ?0 [- P7 m: x
5 mIU/mL (normal <5 mIU/mL). Serum follicular
: |) V9 z' R- F+ ^! U2 vstimulating hormone and leuteinizing hormone
& Q5 M& w7 h* w% J0 ^concentrations were less than 0.05 mIU/mL) S" a# z; c! F& c+ Q+ M" f7 O
(prepubertal).0 B. M6 |9 W8 e# d6 l8 Y
The parents were notified about the laboratory
# D7 V. @, ]/ a3 wresults and were informed that all of the tests were
2 e; z' N# V; G- ^! b) A) v- \normal except the testosterone level was high. The% J% j7 H/ W# g9 w$ q) F% L
follow-up visit was arranged within a few weeks to- z5 g5 Q' {6 s' f1 }: j
obtain testicular and abdominal sonograms; how-
& z4 y3 |7 V8 ?4 Kever, the family did not return for 4 months.) T, T) E8 ?4 T8 v/ w) x ~7 \2 O
Physical examination at this time revealed that the6 L- L8 R$ C+ H4 m; Q& n8 D- u
child had grown 2.5 cm in 4 months and had gained
0 U, {; Y8 d3 o4 w! v+ |5 q2 kg of weight. Physical examination remained
- K& `' X% @ p) W' O! Xunchanged. Surprisingly, the pubic hair almost com-
% h+ v# m, C D1 v: ?2 jpletely disappeared except for a few vellous hairs at
/ Q. k3 |: S0 W6 X. o& \6 x9 ^, tthe base of the phallus. Testicular volume was still 2
- G/ ~% q0 I: o% g4 c( rmL, and the size of the penis remained unchanged.
& P4 ~9 r# B9 I$ bThe mother also said that the boy was no longer hav-
9 c, n4 V/ s& N: Qing frequent erections. K# E6 F& h1 T
Both parents were again questioned about use of9 k. r: R9 |: r
any ointment/creams that they may have applied to8 ?" }, T: \9 @ d# x. a
the child’s skin. This time the father admitted the5 P w( @& _8 i# b+ Y$ v, h$ E
Topical Testosterone Exposure / Bhowmick et al 541
" |2 U" S k+ E/ Z' m# yuse of testosterone gel twice daily that he was apply-
( c- ^& l3 c/ u6 H+ ting over his own shoulders, chest, and back area for/ Q7 m; ]6 r( n4 q R) _
a year. The father also revealed he was embarrassed1 t, j* l# d. p
to disclose that he was using a testosterone gel pre-, \# b$ o/ m. B/ O% q) B
scribed by his family physician for decreased libido& g8 B7 ?7 M6 X
secondary to depression.
0 q3 R- k2 z; w+ R2 d: X& gThe child slept in the same bed with parents.; y2 z( r$ l5 t: O) l y, S
The father would hug the baby and hold him on his0 L* h" P. @6 q* Q7 b1 m" U, c' B
chest for a considerable period of time, causing sig-
9 ~) p x a9 O: Knificant bare skin contact between baby and father.
6 `' ?9 G4 Y0 H: S/ e X/ {% X/ q, fThe father also admitted that after the phone call,
0 q2 ]. s+ j4 d4 W$ n7 nwhen he learned the testosterone level in the baby( x9 L4 F4 o' ]
was high, he then read the product information
* W c: @% |% h; _' C+ gpacket and concluded that it was most likely the rea-
2 N% J8 Z- F8 ason for the child’s virilization. At that time, they
9 F6 _1 \# g8 U5 y1 A, Zdecided to put the baby in a separate bed, and the
1 g) ~! O! `; w0 U+ ofather was not hugging him with bare skin and had6 O0 y& S- @/ J+ ^8 i2 z6 o
been using protective clothing. A repeat testosterone: N/ B$ ^/ B2 n
test was ordered, but the family did not go to the
s5 N( {: l* c1 n6 mlaboratory to obtain the test.
3 D; H0 g. Z" y* J: rDiscussion8 y: l. k$ a/ J: H3 h* H) G9 ^
Precocious puberty in boys is defined as secondary
% H: ?0 G. I4 l% |( B, k/ Fsexual development before 9 years of age.1,4
" w4 Y* k& C' O! {4 ~( W& A3 VPrecocious puberty is termed as central (true) when
( {1 w2 X$ f/ f' V; e: l4 lit is caused by the premature activation of hypo-8 Z- G) r ~% A7 E& _/ k V
thalamic pituitary gonadal axis. CPP is more com-
6 A S7 v S6 imon in girls than in boys.1,3 Most boys with CPP
4 f1 R1 y7 p- k+ qmay have a central nervous system lesion that is
' r% e' z T& h1 A5 Zresponsible for the early activation of the hypothal-- ^( L" w* Z. s: l0 x, b
amic pituitary gonadal axis.1-3 Thus, greater empha- D& s( Y. y4 Y4 u4 x3 L3 E
sis has been given to neuroradiologic imaging in% P+ ]- I, q7 o7 ]- s$ o$ Z9 |5 [
boys with precocious puberty. In addition to viril-) Q/ y& L8 @) v6 r2 I
ization, the clinical hallmark of CPP is the symmet-
0 m( }8 F- [% Z% _rical testicular growth secondary to stimulation by
& o+ A6 y2 P5 F6 ]0 C( Z. {- Xgonadotropins.1,3( f5 ^9 ]+ e+ A: R! r3 N3 T2 r
Gonadotropin-independent peripheral preco-1 q/ f- G$ f9 Q) L$ O
cious puberty in boys also results from inappropriate. ^: D. _7 ?' J- ~/ @
androgenic stimulation from either endogenous or$ `; g) }5 _; ~& G
exogenous sources, nonpituitary gonadotropin stim-
6 V+ R5 D) C! s4 c- Vulation, and rare activating mutations.3 Virilizing
/ C9 p" c! d& \7 {congenital adrenal hyperplasia producing excessive( ?, B5 h$ N6 j
adrenal androgens is a common cause of precocious& C, l2 I5 v3 R0 i1 |& O- X! c4 }- z
puberty in boys.3,48 O7 a/ V& M9 w) o- e% `' _/ U
The most common form of congenital adrenal0 }' @. O( B- g0 c4 B- ~+ X
hyperplasia is the 21-hydroxylase enzyme deficiency.
! {! T7 ?+ h$ y6 AThe 11-β hydroxylase deficiency may also result in
- d: Z P8 J/ O! O( {excessive adrenal androgen production, and rarely,
6 ^$ R7 s, T5 }' D }$ Han adrenal tumor may also cause adrenal androgen
( E+ h( U- l3 iexcess.1,3! m7 V" P z7 Y! Q% b, F
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
, c- w, ~* o: p9 I! T- E542 Clinical Pediatrics / Vol. 46, No. 6, July 2007( Q. d% h& Y! W3 S( b/ K2 p2 |
A unique entity of male-limited gonadotropin- {3 M1 m/ t8 w9 {! y$ z
independent precocious puberty, which is also known
4 m2 Z0 C p% h! H& Z: Oas testotoxicosis, may cause precocious puberty at a. ]6 n- J: ^1 {" P2 |. z
very young age. The physical findings in these boys
5 P- Y8 i$ {+ t0 l% v! H8 H2 Awith this disorder are full pubertal development,9 l8 I+ O! k5 V' c8 T
including bilateral testicular growth, similar to boys
4 x/ i- k) A4 c: [- y% Nwith CPP. The gonadotropin levels in this disorder# e. I$ w: h* I! J* _
are suppressed to prepubertal levels and do not show% o: e- W" B5 A+ i
pubertal response of gonadotropin after gonadotropin-! G. ~: G3 `/ F) X
releasing hormone stimulation. This is a sex-linked, d. K" w! ?8 p' W
autosomal dominant disorder that affects only
e) c/ R! c6 a h- Cmales; therefore, other male members of the family
, L! f, }. \: Zmay have similar precocious puberty.3
, |+ i/ K' C, ?2 J$ t- O8 j# dIn our patient, physical examination was incon-; `5 \, r4 N3 \- O+ j
sistent with true precocious puberty since his testi-2 X: W- i& c! G( q) {
cles were prepubertal in size. However, testotoxicosis+ I0 q# L9 ^7 C& S) |/ V
was in the differential diagnosis because his father
3 d( j9 k: z4 L% Gstarted puberty somewhat early, and occasionally,* v) i3 v2 G d7 K
testicular enlargement is not that evident in the
/ h2 U4 `1 b% \: Y6 Ybeginning of this process.1 In the absence of a neg-6 V. |; j' L% B& V6 e# ]
ative initial history of androgen exposure, our
% K/ R/ N" o( k# y1 x' L+ Kbiggest concern was virilizing adrenal hyperplasia,
( v. e) [( o9 Z2 b3 Zeither 21-hydroxylase deficiency or 11-β hydroxylase
8 E1 n3 a+ b% o/ G" Kdeficiency. Those diagnoses were excluded by find-
, s0 w5 {2 a- g5 @2 m8 J( z. ^% fing the normal level of adrenal steroids.1 E: |7 N' z7 ~# }; X' W# I
The diagnosis of exogenous androgens was strongly! u# V5 P4 P; t" _4 |( k
suspected in a follow-up visit after 4 months because( O( h7 | ?6 K. X1 y. H4 R4 N
the physical examination revealed the complete disap-, k4 l& O; q. S
pearance of pubic hair, normal growth velocity, and* [" H1 w, L9 G
decreased erections. The father admitted using a testos-
2 j9 D% x, C: Z: b, M$ c' b# @terone gel, which he concealed at first visit. He was1 ^4 n; Z T6 @/ j" C0 H
using it rather frequently, twice a day. The Physicians’% J* D! \7 `: I3 {* c! }
Desk Reference, or package insert of this product, gel or( ?* A W0 {; k6 P; y) D
cream, cautions about dermal testosterone transfer to
7 y( T' I2 u# Q' t; Y) qunprotected females through direct skin exposure.% Q( o+ N- B' L
Serum testosterone level was found to be 2 times the2 r! Q1 Y2 D) V8 P0 o
baseline value in those females who were exposed to+ O9 e% j" c: }7 ^( R
even 15 minutes of direct skin contact with their male" u( V; U) Y' h/ A; Z0 l+ w9 ] D
partners.6 However, when a shirt covered the applica-
+ M& w+ X* P( k" Mtion site, this testosterone transfer was prevented.8 M$ }* g# b- r7 e
Our patient’s testosterone level was 60 ng/mL,$ o9 Y1 }6 l; x
which was clearly high. Some studies suggest that" I5 n7 z2 Q1 o( B" J1 {9 G, o
dermal conversion of testosterone to dihydrotestos-
+ Z8 X1 C) T" e- Nterone, which is a more potent metabolite, is more! M+ w& `" `/ u/ o3 g# I* K
active in young children exposed to testosterone
7 Q& S* j# U q/ a6 ~# a$ U; j& Yexogenously7; however, we did not measure a dihy-
& b! L: G7 j) o# @6 ]drotestosterone level in our patient. In addition to
8 g$ S* o4 N7 f) C5 p7 svirilization, exposure to exogenous testosterone in) }% A6 @, c. ]4 G M% i1 [
children results in an increase in growth velocity and
, ?1 E; }3 g, P* c7 _- |$ u3 _advanced bone age, as seen in our patient.
# o& W- H* ?6 @- SThe long-term effect of androgen exposure during
# d- P7 @/ W* {+ ^ p4 v8 Qearly childhood on pubertal development and final- z4 `; t$ p+ R3 ^- f
adult height are not fully known and always remain
/ K' F! \) b+ R( G* Ya concern. Children treated with short-term testos-
& F* I) S: E- q @& e$ nterone injection or topical androgen may exhibit some
5 k: m% A; h2 O* A- `9 f) r2 Zacceleration of the skeletal maturation; however, after; [7 H: f, V3 R" T6 ?2 R. ~2 f
cessation of treatment, the rate of bone maturation
0 C& j8 m3 s. `* w- W# L8 `. `decelerates and gradually returns to normal.8,9
' A( `5 k0 ~: k$ `0 L) g4 YThere are conflicting reports and controversy- W* O- _* U" \7 X H: e! G0 c
over the effect of early androgen exposure on adult
! H, {) A& ]( ?penile length.10,11 Some reports suggest subnormal
, g4 }* A1 f8 s0 b! f% x% |adult penile length, apparently because of downreg-
4 z o# s O& g. [) Uulation of androgen receptor number.10,12 However,* Z# l8 K$ o/ V6 ]2 D
Sutherland et al13 did not find a correlation between
, {% n9 i9 ^$ Q+ z0 ]childhood testosterone exposure and reduced adult
; r/ E; A1 `; d9 V- I7 gpenile length in clinical studies.
0 |8 N9 W) r, fNonetheless, we do not believe our patient is& q; r+ m6 U4 b$ ]
going to experience any of the untoward effects from
( d7 H2 a ~" i( @; B! Ltestosterone exposure as mentioned earlier because
2 ^3 f4 u% |. j3 H! n* Tthe exposure was not for a prolonged period of time.
) o" U7 V) c) iAlthough the bone age was advanced at the time of
2 ?5 Y3 }2 c2 Z' |8 Fdiagnosis, the child had a normal growth velocity at
7 \6 F: P3 y& ]- zthe follow-up visit. It is hoped that his final adult$ Q' i( O8 g1 V. C
height will not be affected.
1 P3 v9 F' _+ O0 hAlthough rarely reported, the widespread avail-+ D) Y# r: M* I$ o4 N! m
ability of androgen products in our society may
& y7 c% P# U6 M E, dindeed cause more virilization in male or female
! g/ \0 w, e) o* q& bchildren than one would realize. Exposure to andro-
$ Z5 K8 m0 B% M( c" ]: _( S1 @gen products must be considered and specific ques-$ ?1 z4 k+ [0 q& }: O+ {
tioning about the use of a testosterone product or( _( Y6 c9 k# \" W5 c ]
gel should be asked of the family members during! o. C1 f2 k7 H1 G) h1 V
the evaluation of any children who present with vir-3 c- g# z& z* `# ^
ilization or peripheral precocious puberty. The diag-
# m9 u. J8 m& z: _nosis can be established by just a few tests and by
& N3 ]" N D1 g H6 V: eappropriate history. The inability to obtain such a# ^* q8 S+ X" s7 L
history, or failure to ask the specific questions, may& u" v3 r; ?( \) F& y8 B( M; U
result in extensive, unnecessary, and expensive
1 W% g3 I- S. Y I9 @' [investigation. The primary care physician should be
. l: O, ]0 ~0 `$ q9 u% d/ {# L! Gaware of this fact, because most of these children
) ~* J- Y; y0 I8 f( jmay initially present in their practice. The Physicians’0 ?* J: O) H4 _, X8 t3 N$ q3 |
Desk Reference and package insert should also put a
; R( u& f$ c! M5 [& y4 E! `warning about the virilizing effect on a male or
% h1 o3 O/ V, }' v; \female child who might come in contact with some-* Q4 N* n- _4 y) Q! K. c
one using any of these products.+ d" \9 z6 \# q1 }! y$ S
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3 ~4 P1 X2 F0 {; }2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious( l& @' P* x+ ?! c0 y, C5 h
puberty in children with tumours of the suprasellar pineal
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exposure to testosterone. Pediatrics. 1999;104:e23.
! h7 Z) ?* c& N7 E$ [+ i5 ~, l/ d5. Greulich WW, Pyle SI, eds. Radiographic Atlas of2 h. ^, t3 ? o- @. B
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`1 _2 h# W4 s( p: hStanford, CA: Stanford University Press; 1959.
$ ~* r9 u( N0 l- O% b t6. Physicians’ Desk Reference. Androgel 1% testosterone,
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( `6 T# k5 E3 C4 z4 w. f6 QEconomics Company, Inc; 2004:3239-3241.
; C2 J; e0 L5 y v8 _. x1 }7. Klugo RC, Cerny JC. Response of micropenis to topical8 j! |0 h$ v0 D, H) r
testosterone and gonadotropin. J Urol. 1978;119:
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8. Guthrie RD, Smith DW, Graham CB. Testosterone
: o, j! l2 ~3 F0 Jtreatment for micropenis during early childhood. J Pediatr.
& l- v+ ~, V- X$ e% T& M9 B1973;83:247-252., f* V: {8 w' C1 m$ R
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