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is a significant concern for physicians. Central4 B) k1 b% {% }; j0 }! v7 a
precocious puberty (CPP), which is mediated! U1 r j7 _: {: z/ r j( l
through the hypothalamic pituitary gonadal axis, has
% E: t8 ]. ^- H$ Ya higher incidence of organic central nervous system: u4 V6 V1 i6 L; J* w
lesions in boys.1,2 Virilization in boys, as manifested; k" A& I" H9 i1 `
by enlargement of the penis, development of pubic
C2 O% c( R, N! ?/ ihair, and facial acne without enlargement of testi-
( |: Q* D+ j* }/ c( B {cles, suggests peripheral or pseudopuberty.1-3 We0 l0 K$ w" ~& a, k! O, h: H
report a 16-month-old boy who presented with the+ e/ m1 j$ U- r3 F; e7 z8 z. l
enlargement of the phallus and pubic hair develop-
+ U I' \1 H! _$ [- H( Cment without testicular enlargement, which was due
) s" _ d6 `0 g% ?7 sto the unintentional exposure to androgen gel used by
; A! v' y% R7 G$ b3 o: G, C* c/ Kthe father. The family initially concealed this infor-
" w+ |$ ]0 V. y2 E; u$ ^+ `2 j8 E {# emation, resulting in an extensive work-up for this1 [- X8 y1 X/ @/ C5 k& L6 P! ~
child. Given the widespread and easy availability of
9 h2 @# h# W4 l& }1 Ctestosterone gel and cream, we believe this is proba-. T: j+ N2 ~# a
bly more common than the rare case report in the' P2 @' \$ G! b, F% Z6 H. ]
literature.4
) p, L! B8 X( x! M OPatient Report& X! S( [) }/ Y; h
A 16-month-old white child was referred to the
+ |- S! q- Q/ w% g; k6 bendocrine clinic by his pediatrician with the concern% |7 h: a& ^# D9 D( ]. p
of early sexual development. His mother noticed
1 N& H( o4 _. c9 O/ Y7 Ulight colored pubic hair development when he was9 ]. i/ K0 X' m2 `! B( k
From the 1Division of Pediatric Endocrinology, 2University of$ M1 H: H8 r4 [! K: O! S6 G6 z1 M
South Alabama Medical Center, Mobile, Alabama.
: _. o$ v d; d& fAddress correspondence to: Samar K. Bhowmick, MD, FACE,4 ~0 s. ]8 e" M$ j
Professor of Pediatrics, University of South Alabama, College of
0 p0 a; o) d, t' `Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
$ J) q6 G" m* \; ~. y; j2 o; z8 h% qe-mail: [email protected].) I' \3 l9 i8 ], x
about 6 to 7 months old, which progressively became
& @6 o% Y k0 p' B' E8 Rdarker. She was also concerned about the enlarge-
# V( ^! {( q0 z# ^9 ~ V) ^ xment of his penis and frequent erections. The child
8 t+ a- e7 R/ \9 f" G1 ^0 Ewas the product of a full-term normal delivery, with3 B' ~6 J" \4 w6 Z7 _8 e% }
a birth weight of 7 lb 14 oz, and birth length of7 l2 f* ~& r! v/ ^
20 inches. He was breast-fed throughout the first year
- Z, y$ U; v6 @1 }( P* Q/ g5 Uof life and was still receiving breast milk along with
" O+ o) `2 M5 s5 _4 ~) O0 v" P( jsolid food. He had no hospitalizations or surgery,( Y* z" K" H5 @5 H
and his psychosocial and psychomotor development, ?! P0 {3 h5 v1 r- l0 J* M5 k
was age appropriate.3 a. u9 R1 ]$ X; L- _
The family history was remarkable for the father,0 Z, ]) C5 s$ a$ ]" {
who was diagnosed with hypothyroidism at age 16,/ G; a$ }! N; U* _7 L2 P6 k2 ~
which was treated with thyroxine. The father’s
. C7 y! u9 x4 ~0 |0 L. P9 bheight was 6 feet, and he went through a somewhat" J8 n- g- m( N( h0 P) e. h
early puberty and had stopped growing by age 14./ R& l) ^' {: C" \0 W. H8 j' L8 t- E
The father denied taking any other medication. The
9 \- I1 w* A/ h1 N) W" [child’s mother was in good health. Her menarche
0 a# m. |! p) x! f7 w( U% lwas at 11 years of age, and her height was at 5 feet
& u/ L$ W9 J8 s! U. o/ y# l4 M! _2 N5 inches. There was no other family history of pre- H' S8 w' N1 F5 ?; w
cocious sexual development in the first-degree rela-
& |2 Q& r- i3 f& Dtives. There were no siblings.
: J: F! L y" r% q) iPhysical Examination& Y9 b }3 ~$ R
The physical examination revealed a very active,
5 W3 X; W* c7 Z6 Fplayful, and healthy boy. The vital signs documented
2 z+ Q5 I' l- [. Aa blood pressure of 85/50 mm Hg, his length was% q* j/ T" e# b* M! Q7 g" h. B
90 cm (>97th percentile), and his weight was 14.4 kg
/ O4 V8 f- I) @/ z. C9 W, l X(also >97th percentile). The observed yearly growth
( t3 F& M4 h! X- P1 Gvelocity was 30 cm (12 inches). The examination of; v& w M3 N' L" I
the neck revealed no thyroid enlargement.6 V3 D& j& v* O
The genitourinary examination was remarkable for
% {9 m* F! u( m7 U! ?enlargement of the penis, with a stretched length of, x1 t. c _6 f
8 cm and a width of 2 cm. The glans penis was very well! b5 |8 ` U( Z2 c. W1 T/ C$ E
developed. The pubic hair was Tanner II, mostly around7 {1 \5 W- D# g/ m8 I6 D7 v6 N: p, ?! Z
540
( K5 w2 H6 o4 W* m: @at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
# Z4 h; q1 A2 n9 d& m- K1 x5 Lthe base of the phallus and was dark and curled. The% N4 K9 ~; K7 s7 K
testicular volume was prepubertal at 2 mL each.
; m0 K0 h- ?, r, I5 J* p* E. lThe skin was moist and smooth and somewhat
/ w% j% s4 R: W! P, ^+ @5 Loily. No axillary hair was noted. There were no
: R, Q: T6 ?0 D+ f; r+ dabnormal skin pigmentations or café-au-lait spots.
2 K8 c4 _0 `! a7 y, QNeurologic evaluation showed deep tendon reflex 2+
$ i; l, c7 T3 v, ubilateral and symmetrical. There was no suggestion& t5 W! `5 [1 _: I: ~ {; K& e
of papilledema.
5 y- z- |8 d4 M% z! Z. Q& R# qLaboratory Evaluation
; C3 @+ I+ ]/ A3 C* uThe bone age was consistent with 28 months by
% n4 L! E% Y6 ~* a+ Y; musing the standard of Greulich and Pyle at a chrono-
8 o4 d' p9 ~) b/ d& Nlogic age of 16 months (advanced).5 Chromosomal! J; l, }$ E3 ?9 R. O
karyotype was 46XY. The thyroid function test) _1 Q \( l* B6 \$ C/ ^
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
* E; ]/ a! T# glating hormone level was 1.3 µIU/mL (both normal).
, R0 W7 [+ `/ |5 Q/ g2 z. m8 h+ k0 K9 ~# LThe concentrations of serum electrolytes, blood
9 x. O5 y l+ k9 d' Purea nitrogen, creatinine, and calcium all were
+ q' v. y. s+ ?4 H/ M# I uwithin normal range for his age. The concentration
# w U$ P+ |" y7 ~. x U2 F$ K6 Aof serum 17-hydroxyprogesterone was 16 ng/dL
6 c# G2 I7 n& m+ L& S5 f/ c8 b, @(normal, 3 to 90 ng/dL), androstenedione was 20
( T" u% S& i* d* l5 ~ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
' ?! b5 x# t6 t4 dterone was 38 ng/dL (normal, 50 to 760 ng/dL),- u8 h s `8 G+ K. ?: u9 g9 ]5 ?
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
8 [8 L& s1 s6 u# g( K1 d8 z49ng/dL), 11-desoxycortisol (specific compound S)
: R0 Y' \! I# K% g/ Dwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-% |$ Q! k; s3 u1 U* y8 b
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
# R& U! O+ |7 q" ^% `0 Xtestosterone was 60 ng/dL (normal <3 to 10 ng/dL),
0 X! |/ {8 V" c3 ]/ W7 M# dand β-human chorionic gonadotropin was less than
% m R$ O% W0 y' P; z( b5 mIU/mL (normal <5 mIU/mL). Serum follicular& c# R3 m/ P* i3 }
stimulating hormone and leuteinizing hormone' H5 t) ^* K$ n6 s
concentrations were less than 0.05 mIU/mL" H" y9 q6 I- ?; ?+ Y
(prepubertal).
2 B4 d3 v; P7 y0 CThe parents were notified about the laboratory f" k+ `- ?( D
results and were informed that all of the tests were+ _" b8 J$ p) C# Z1 n; q& `+ {
normal except the testosterone level was high. The- I1 ~0 p( q7 a6 f8 h2 K
follow-up visit was arranged within a few weeks to
- @2 W5 A" t& Gobtain testicular and abdominal sonograms; how-
3 Q! v" f5 U, c- \$ S9 Yever, the family did not return for 4 months.
/ r% }8 j0 ]6 j( w$ d P+ sPhysical examination at this time revealed that the( e# X- @; N+ U8 G. f, |
child had grown 2.5 cm in 4 months and had gained# y1 m7 S' n5 x. l
2 kg of weight. Physical examination remained/ \9 w) V0 h- w S4 \% C
unchanged. Surprisingly, the pubic hair almost com-
, g* Z- Z& D1 S- mpletely disappeared except for a few vellous hairs at
; ^( j! o1 Z* A: m; ?2 tthe base of the phallus. Testicular volume was still 2' V+ Z9 R: k( X% P y' w6 P3 c
mL, and the size of the penis remained unchanged.6 S0 ^9 @0 ~" h. T( ?3 ^+ F
The mother also said that the boy was no longer hav-# j# l0 J. R5 z6 I$ D
ing frequent erections.8 P; }8 W4 Y- h' |. M- B+ B; R7 g4 }
Both parents were again questioned about use of
! D" D8 P8 E R- A6 k6 {any ointment/creams that they may have applied to4 p. ~" t! k! U3 J( ]
the child’s skin. This time the father admitted the
- }) p* R. l1 Y: K$ o# @4 wTopical Testosterone Exposure / Bhowmick et al 541
# h3 D8 o8 P1 Cuse of testosterone gel twice daily that he was apply-
2 d- d3 `# p2 \, A# k iing over his own shoulders, chest, and back area for+ T H9 }0 p6 ?* T7 P
a year. The father also revealed he was embarrassed' S( b4 [/ [% l& z. {
to disclose that he was using a testosterone gel pre-
3 F: h; {1 k& @6 t8 N$ J- Vscribed by his family physician for decreased libido
% `5 Z( `9 B$ V+ ssecondary to depression.
+ I3 M4 J; _* K: t" R/ ~% KThe child slept in the same bed with parents.
4 U; b) Y( x* G0 i+ rThe father would hug the baby and hold him on his
`8 T5 b* B: `: O( z' W" U3 pchest for a considerable period of time, causing sig-/ Y/ Z; a$ r& k* L. e6 f" |
nificant bare skin contact between baby and father.
9 O, n. J4 q, IThe father also admitted that after the phone call," K/ {- }; o' ]2 L$ a
when he learned the testosterone level in the baby
: t6 C) a7 g5 \ awas high, he then read the product information
8 w8 T: |+ \0 w+ _6 }) E) j4 w1 t6 dpacket and concluded that it was most likely the rea-* h! ~% B) j$ F$ U1 H- `
son for the child’s virilization. At that time, they A: i7 Q/ g8 @* ^/ e- l7 e
decided to put the baby in a separate bed, and the
1 x9 N+ ]- \, k, pfather was not hugging him with bare skin and had' t! {8 g" V: A4 |) k
been using protective clothing. A repeat testosterone! X$ S9 w# f! [& I) K, b
test was ordered, but the family did not go to the
8 L4 W( r% b" D6 r. L3 slaboratory to obtain the test.
' b1 o5 r/ O4 I F0 _2 h2 F1 x8 z0 y- ~Discussion4 c! }9 T7 L- m( f. C) r; B5 d3 N+ n
Precocious puberty in boys is defined as secondary7 {7 M/ u h* w5 O" ^+ {7 b
sexual development before 9 years of age.1,4
- z+ C0 H( `& {2 c6 M' jPrecocious puberty is termed as central (true) when0 G+ W [1 ]8 ?3 j
it is caused by the premature activation of hypo-; J% S# `/ n) u+ I
thalamic pituitary gonadal axis. CPP is more com-
+ d3 `4 V/ m) ~7 H3 }mon in girls than in boys.1,3 Most boys with CPP
5 w& e9 V! r @! P! wmay have a central nervous system lesion that is
# u6 ^$ y7 K( x& S9 k9 e ~responsible for the early activation of the hypothal-
0 g) E& B/ f6 K+ i- v( z& i6 Namic pituitary gonadal axis.1-3 Thus, greater empha-. [! h8 \8 I6 n% }( d4 h
sis has been given to neuroradiologic imaging in$ a4 R- c5 u% K! \& C# J
boys with precocious puberty. In addition to viril-
0 E& ^: s6 y. E2 P( q9 o+ uization, the clinical hallmark of CPP is the symmet-/ G- b) P6 A3 t% H v4 f
rical testicular growth secondary to stimulation by, @8 D* h6 g* _4 X+ w: w7 [# ~ {. e
gonadotropins.1,3
" r4 w0 @ t. p. a- S5 OGonadotropin-independent peripheral preco-* n- K& b: t! ]7 ~
cious puberty in boys also results from inappropriate
; Z# C/ @9 `1 t- d. |, Wandrogenic stimulation from either endogenous or
' m1 B1 n6 ^. N ~, w. Y! n Gexogenous sources, nonpituitary gonadotropin stim-! r/ S# T4 s" S& G! C0 U& [
ulation, and rare activating mutations.3 Virilizing3 i1 k) {, Y% b, Y, ]
congenital adrenal hyperplasia producing excessive
7 R. h3 i& k! ~adrenal androgens is a common cause of precocious9 ^# s' j3 ~) ^8 e6 U7 A' ?# h
puberty in boys.3,4' i! {; @& j/ e! g, l& o! g! O
The most common form of congenital adrenal
& k* {( H4 M! g4 chyperplasia is the 21-hydroxylase enzyme deficiency.
& {) h3 l+ j# P6 g8 b, uThe 11-β hydroxylase deficiency may also result in! L3 c6 h8 u! O; [& X
excessive adrenal androgen production, and rarely,
' V9 {, T- K q' i1 Z# Ran adrenal tumor may also cause adrenal androgen
4 K! I, ]: k! |8 M% x. eexcess.1,3( d' H1 {% E3 `* y9 s
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from6 f& e5 U: y& a G' {% |3 R
542 Clinical Pediatrics / Vol. 46, No. 6, July 20075 a2 L+ j- _7 z
A unique entity of male-limited gonadotropin-8 o" P6 _7 V+ M: w8 t$ \5 a: Q+ c( N
independent precocious puberty, which is also known
, E5 s6 j1 ~2 A+ Aas testotoxicosis, may cause precocious puberty at a
% ^2 S0 e* d# |5 S, l2 w! ~very young age. The physical findings in these boys
4 d5 ^4 q: r6 y2 ]$ ~' p* Xwith this disorder are full pubertal development,) {% x7 |0 U; y6 n
including bilateral testicular growth, similar to boys6 \3 ~! I- N, z4 y
with CPP. The gonadotropin levels in this disorder
+ R) H! e$ ]# C( N" |( M; eare suppressed to prepubertal levels and do not show
& z7 N' {/ g2 U/ hpubertal response of gonadotropin after gonadotropin-
$ p3 n) A8 R+ Q- e* e8 g: Sreleasing hormone stimulation. This is a sex-linked8 p$ G) H; `2 P3 Z
autosomal dominant disorder that affects only/ s, |9 v3 y( ~2 t; O1 x% g. Z
males; therefore, other male members of the family- l, L4 o; |: t8 f
may have similar precocious puberty.3; Z6 X; ^) J, G6 b5 C$ C
In our patient, physical examination was incon-
" a% C* K1 Y$ ]0 @ J! Tsistent with true precocious puberty since his testi-+ G7 X8 A- M% ~) b+ b
cles were prepubertal in size. However, testotoxicosis# A, }4 e. C, m) Z) j2 T
was in the differential diagnosis because his father
4 \) N; c( H$ K! n0 u& Hstarted puberty somewhat early, and occasionally,
$ {* j3 R$ {* |2 g/ _" ?* otesticular enlargement is not that evident in the- r+ {( I! S& V+ J
beginning of this process.1 In the absence of a neg-8 W. o$ v" c7 T" ?5 B4 N
ative initial history of androgen exposure, our
?# k% K6 k2 M, m$ ?biggest concern was virilizing adrenal hyperplasia,
" f: K/ H* a6 n: v. meither 21-hydroxylase deficiency or 11-β hydroxylase
* [- H3 |4 W6 i a) {1 Q( udeficiency. Those diagnoses were excluded by find-
$ A. \3 F# [ D* q& Y/ J Ting the normal level of adrenal steroids.& S% m1 H; N; R" P# m* W v2 K
The diagnosis of exogenous androgens was strongly4 }/ v! t/ M# {2 e& X! o3 Z! Q
suspected in a follow-up visit after 4 months because3 S! b2 A* C' E- X& K& W- b8 k
the physical examination revealed the complete disap-
# r" n- l. Y5 p+ H5 Npearance of pubic hair, normal growth velocity, and
3 W: A& c# y) ~decreased erections. The father admitted using a testos-
* u2 p/ f$ W1 |4 D- bterone gel, which he concealed at first visit. He was
7 ?8 k2 Q* u& r* n$ j6 A" T- susing it rather frequently, twice a day. The Physicians’- E4 F# x# I) p3 X+ d( F5 C5 O+ r
Desk Reference, or package insert of this product, gel or1 @0 B' X! b4 n) \6 M- O
cream, cautions about dermal testosterone transfer to
7 I! P1 D t/ j/ \unprotected females through direct skin exposure.
/ t3 o3 k$ S( TSerum testosterone level was found to be 2 times the
# J7 s) J! k" Ebaseline value in those females who were exposed to
' ?8 v$ f+ Y5 x2 q2 i+ X' W; T2 `even 15 minutes of direct skin contact with their male
. U7 W1 z0 r1 [- z' |: v; g dpartners.6 However, when a shirt covered the applica-
- U3 K9 Y4 F/ F6 }# D( Vtion site, this testosterone transfer was prevented.
4 A; z" A: s- f* b# ?Our patient’s testosterone level was 60 ng/mL,
! [ o5 R& z* X; ^which was clearly high. Some studies suggest that, ^0 A. D8 C1 [, F @ Q: o
dermal conversion of testosterone to dihydrotestos-
! h& t! e. a# }" [terone, which is a more potent metabolite, is more8 \9 N3 o. Q* r! X7 B9 G8 H
active in young children exposed to testosterone3 d, z& x s3 T6 s/ |% R5 I
exogenously7; however, we did not measure a dihy-
) i0 D& | a! X; Pdrotestosterone level in our patient. In addition to
- v- j- A' Q( svirilization, exposure to exogenous testosterone in5 ^$ f7 F2 ]* r( L X( J7 E
children results in an increase in growth velocity and
$ m3 j X& ~4 n& \! U0 w% D O& Eadvanced bone age, as seen in our patient. x- K/ |7 R5 n6 B8 n% c
The long-term effect of androgen exposure during- E; g% a( ]" a \: f& w
early childhood on pubertal development and final9 w8 f% K# u' \" _3 t
adult height are not fully known and always remain4 e" d+ e+ y7 }+ i- ~
a concern. Children treated with short-term testos-* E/ x* x; \: F8 m+ r" {4 y: C+ T
terone injection or topical androgen may exhibit some
& @# J& r* F2 R6 p+ bacceleration of the skeletal maturation; however, after& g7 l3 k. A X n8 D8 U
cessation of treatment, the rate of bone maturation
* K' k( q. g, k O/ W$ O. p3 Qdecelerates and gradually returns to normal.8,9$ {& x/ ^: v9 m7 Q7 a; P$ a
There are conflicting reports and controversy
5 e: N- z' q; Vover the effect of early androgen exposure on adult
' W# B2 b' F7 Y! V3 {8 @' Bpenile length.10,11 Some reports suggest subnormal& J. W3 E$ t6 r
adult penile length, apparently because of downreg-& p3 }, E3 s# A
ulation of androgen receptor number.10,12 However,5 z. Z% I7 q1 P! j/ t
Sutherland et al13 did not find a correlation between4 V8 R- N/ {& U, @& q8 Y2 [
childhood testosterone exposure and reduced adult: l! t. l* n7 x }/ F' Y
penile length in clinical studies.
+ Y3 s8 @6 c$ f) U# f& mNonetheless, we do not believe our patient is4 i& B9 J3 k3 D& ^7 @6 O" g
going to experience any of the untoward effects from
9 g; X, l* k8 F: B$ O' m2 _testosterone exposure as mentioned earlier because& ?) N: J) }% G# ^) \" o) v, s
the exposure was not for a prolonged period of time.
1 p* j# y% x9 D# HAlthough the bone age was advanced at the time of
( Y* ^8 v3 O/ ^5 v( g6 ]diagnosis, the child had a normal growth velocity at9 F4 m5 [: M! ^& ?* L
the follow-up visit. It is hoped that his final adult2 t( ?& S# |- Z' j
height will not be affected.
+ w* J/ [9 |2 dAlthough rarely reported, the widespread avail-0 D& ^# k7 T' i7 i! ~% T8 Y
ability of androgen products in our society may
! q: V. K4 ^/ V0 [, cindeed cause more virilization in male or female
& g! g; c. {) Z3 ]* y2 c' m$ d5 A, T( _children than one would realize. Exposure to andro-
6 R0 v" @* M' @' R5 @gen products must be considered and specific ques-
3 j, ~9 t6 f' S: K/ A) r; t$ g" ytioning about the use of a testosterone product or, b9 ^2 L+ \9 Z) R4 l9 c. O
gel should be asked of the family members during8 F4 X- ~' n# y+ l
the evaluation of any children who present with vir-* \1 o2 x) e M+ J$ ~% ~. W" W
ilization or peripheral precocious puberty. The diag-
, l" h8 R2 I* {nosis can be established by just a few tests and by
5 h: ]/ M& y! o" b/ o7 @8 t' p" {appropriate history. The inability to obtain such a
/ j) e V' O. B1 v. ~history, or failure to ask the specific questions, may. O7 {9 ?& [4 ]7 R
result in extensive, unnecessary, and expensive; r$ V7 ]3 @+ ^: A) o
investigation. The primary care physician should be" p. Q' B7 y7 F s
aware of this fact, because most of these children
2 O3 \/ [% d( D' V/ j- j9 ?" C9 mmay initially present in their practice. The Physicians’
& r8 ^8 L( k& Y4 MDesk Reference and package insert should also put a
: @0 j3 g% e% ?, P0 [" R1 B0 ywarning about the virilizing effect on a male or8 l: n6 M; |6 c+ C! j
female child who might come in contact with some-
2 O r8 j) M- O Z2 b, s% ^one using any of these products.
' v- F8 z, o$ ]6 M" \References
3 w" \7 H7 e9 F6 \5 B) ]/ G) [4 o) M6 _1. Styne DM. The testes: disorder of sexual differentiation5 d& s3 N' E3 P: I
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" {8 y9 a4 B% y7 f' [1 Q8 z! w+ Wpuberty in children with tumours of the suprasellar pineal( Q d$ C6 l' e9 I: w" p1 E$ f
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/ p, G. O8 p2 R8 d. m4 Gareas: organic central precocious puberty. Acta Paediatr.
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3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.
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exposure to testosterone. Pediatrics. 1999;104:e23." k6 B. T8 ~! b
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Skeletal Development of the Hand and Wrist. 2nd ed.
V3 R0 `/ Z: `Stanford, CA: Stanford University Press; 1959.
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