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is a significant concern for physicians. Central
a% K- b8 S/ q) f! M. gprecocious puberty (CPP), which is mediated3 y/ S( K7 E9 s; j7 S7 i
through the hypothalamic pituitary gonadal axis, has
: w9 j+ r+ J9 Z( M9 j! c( ~* ^a higher incidence of organic central nervous system
4 H* f& _/ \- g) k: F. q0 mlesions in boys.1,2 Virilization in boys, as manifested
. l$ y8 R& A5 y4 k- eby enlargement of the penis, development of pubic. q" Z; r$ H: G
hair, and facial acne without enlargement of testi-8 D6 X3 E6 z( D D1 c- b
cles, suggests peripheral or pseudopuberty.1-3 We
6 G: o5 f! w5 B$ C2 ~, hreport a 16-month-old boy who presented with the
+ j1 u; x7 U7 ^% S" @3 |' F! Eenlargement of the phallus and pubic hair develop-4 S4 y; f6 o4 X) m$ D; f5 K
ment without testicular enlargement, which was due9 x3 y1 C0 B2 @" g& x" u/ Z
to the unintentional exposure to androgen gel used by
6 {* P8 b a, m7 T( G4 h* Zthe father. The family initially concealed this infor-
8 y& Q+ A% z3 j! c1 p: p* {mation, resulting in an extensive work-up for this
/ A# J) q7 I3 i' z `+ Ychild. Given the widespread and easy availability of C+ j- j3 o8 N" g+ i/ e
testosterone gel and cream, we believe this is proba-/ V2 ~2 \8 V8 M! d0 P3 N# D
bly more common than the rare case report in the! i; j( d- R/ A) }" V$ q e& {8 B
literature.41 i7 U! k% D$ d6 ~( J
Patient Report
3 D0 c2 Z# N$ k/ k7 CA 16-month-old white child was referred to the
- R4 T ~/ k; qendocrine clinic by his pediatrician with the concern. [( Q* N( k2 M
of early sexual development. His mother noticed
4 O: N5 Z# o2 x, _ H3 P; plight colored pubic hair development when he was2 p8 o$ |, i6 @' D* m& M
From the 1Division of Pediatric Endocrinology, 2University of
" m+ ?0 L- U; n' D1 [South Alabama Medical Center, Mobile, Alabama.
3 Z4 i; x2 @4 ^" s8 u$ j/ {Address correspondence to: Samar K. Bhowmick, MD, FACE,
^) d1 B" g1 f- z2 KProfessor of Pediatrics, University of South Alabama, College of
0 A; Q# ?2 u6 N, O; X* jMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;6 j4 T6 \2 o; J, U% B* V3 H# M
e-mail: [email protected].
|2 m( o& O; b5 }, i8 \3 ]* ]about 6 to 7 months old, which progressively became8 j& g0 w5 j- W. R7 v' S
darker. She was also concerned about the enlarge-7 H1 r. s& s+ i. _5 F7 C7 w
ment of his penis and frequent erections. The child
( @: m" a- h5 K3 Z3 v5 @1 vwas the product of a full-term normal delivery, with
0 X$ f* Z7 A6 i8 K* V% c: I* b, `a birth weight of 7 lb 14 oz, and birth length of
+ a' @+ f1 M8 Z3 d% H; ~1 _; S5 g20 inches. He was breast-fed throughout the first year
w6 {* {6 O' H4 |" _% V, oof life and was still receiving breast milk along with
& v1 p# B L" x1 \$ isolid food. He had no hospitalizations or surgery,6 n: p) f% D$ B( P; _
and his psychosocial and psychomotor development
9 P, a& C, K& `6 b vwas age appropriate.+ u2 M, i5 w; c' k
The family history was remarkable for the father,
6 v% }3 H5 H+ @/ ^. Z! o8 Bwho was diagnosed with hypothyroidism at age 16,: O1 }- q. u3 T: }# R
which was treated with thyroxine. The father’s/ ]5 f5 A; B7 g7 I0 R
height was 6 feet, and he went through a somewhat
3 ^5 h* f. u) Y% P2 @9 \early puberty and had stopped growing by age 14.
" \; e2 M! J6 l1 SThe father denied taking any other medication. The* B) N( Q3 I0 X- [& O2 `: e8 z2 w
child’s mother was in good health. Her menarche5 Y o, \1 Z9 [1 q- M" c7 z
was at 11 years of age, and her height was at 5 feet: F9 p+ o! R5 W7 B, q: |+ [
5 inches. There was no other family history of pre-: V( q) M) `( s* ^6 N
cocious sexual development in the first-degree rela-
7 M9 N% `% J$ Y: F' _; Qtives. There were no siblings.
( a6 x4 U I, L. q( |Physical Examination- {% S; W1 ~9 @. y- s7 K
The physical examination revealed a very active,
) w7 _1 ]' @6 N, w; zplayful, and healthy boy. The vital signs documented
! i: A$ W' G8 \% i: ua blood pressure of 85/50 mm Hg, his length was8 t; x h: u! T' A
90 cm (>97th percentile), and his weight was 14.4 kg
* l8 Y. l' J* T) I1 h(also >97th percentile). The observed yearly growth- [; D) k& X+ w( w; e: p
velocity was 30 cm (12 inches). The examination of1 _" S! w' a' c1 ^# E
the neck revealed no thyroid enlargement. H/ _6 X/ _' ?; `: w; U! n3 [
The genitourinary examination was remarkable for
7 J3 Y, {6 d" W1 k: M& y, Penlargement of the penis, with a stretched length of! _& w. ~+ X) G. o4 O F6 z( i/ y7 ?. o
8 cm and a width of 2 cm. The glans penis was very well
% O8 z, v" L# Zdeveloped. The pubic hair was Tanner II, mostly around ?, G6 ^( V# P' o7 Y
540
1 O& [$ P) c: A/ q, p1 K( k* Tat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
7 q; N# w. Z" t9 C1 fthe base of the phallus and was dark and curled. The3 `9 c9 h7 q4 R$ H1 G" @& E. Q
testicular volume was prepubertal at 2 mL each.
+ f3 N# m1 C5 M' g5 _+ o- OThe skin was moist and smooth and somewhat
# s+ Q0 U9 a! D* L7 Goily. No axillary hair was noted. There were no; y) H0 [; Q9 F) D: m4 x7 A
abnormal skin pigmentations or café-au-lait spots.& ] Z5 j) d2 w& p0 H9 f
Neurologic evaluation showed deep tendon reflex 2+
; Z; |/ s6 F6 Tbilateral and symmetrical. There was no suggestion q4 U7 n, s: ~( s5 j
of papilledema.& y: X8 z d* @" ~; h( U
Laboratory Evaluation
3 e$ t+ b0 @# q2 f8 p- Z" h( T) PThe bone age was consistent with 28 months by: \- d) T" ~' L* F
using the standard of Greulich and Pyle at a chrono-! C, Q% S& j& u( J1 ~9 P" K
logic age of 16 months (advanced).5 Chromosomal
. C$ h' D7 O! }( Hkaryotype was 46XY. The thyroid function test
! k {7 u% m0 d% ~# U2 y( q. jshowed a free T4 of 1.69 ng/dL, and thyroid stimu-8 @1 \* @, I& Q/ ^! J+ I8 e+ ~
lating hormone level was 1.3 µIU/mL (both normal).6 k/ {& `/ [* N" l& ^" `
The concentrations of serum electrolytes, blood; e" x+ q5 e; g
urea nitrogen, creatinine, and calcium all were
: c& {% x' o0 V' e4 jwithin normal range for his age. The concentration0 T8 @3 T. k9 b! g" Z% @" L
of serum 17-hydroxyprogesterone was 16 ng/dL
4 q) U2 `# Q6 k# |% X! _; t! }1 Q# S(normal, 3 to 90 ng/dL), androstenedione was 20# a* s# h, }4 p3 p( s# X
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-( T8 Y! }$ `# @6 y' g/ I7 y
terone was 38 ng/dL (normal, 50 to 760 ng/dL),2 t) l5 G. A. q) v& W* Y
desoxycorticosterone was 4.3 ng/dL (normal, 7 to$ Y r5 {8 [. y3 K1 W [: C* }
49ng/dL), 11-desoxycortisol (specific compound S)
& f; d7 ^9 }: z6 p) {1 u! cwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-6 K$ U7 z" G9 x2 S) |5 r6 S+ L$ L4 ~
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total0 _6 g" n0 e8 G7 u- R2 C% z% B' g
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
: T5 R+ e- B3 c1 o" Xand β-human chorionic gonadotropin was less than
: Z! G- T4 a/ q& a5 mIU/mL (normal <5 mIU/mL). Serum follicular0 S5 n7 }6 N. S2 [0 D2 `: G
stimulating hormone and leuteinizing hormone
: ^2 l q( n. H* sconcentrations were less than 0.05 mIU/mL
" L3 ^( T1 H, D3 X* i4 ]' \2 |(prepubertal).1 v! e& Y, Q5 ?5 h! s! a3 T! U6 @( Z
The parents were notified about the laboratory
) T2 m D8 `! U, _( ~/ s1 E) Kresults and were informed that all of the tests were' O1 P4 x& d" a( u, o6 B
normal except the testosterone level was high. The2 r% f" {. k( Z& m/ C3 [0 [
follow-up visit was arranged within a few weeks to
8 ?% D8 y. h( n9 Y( hobtain testicular and abdominal sonograms; how-0 V2 ^. \* Y+ }; Q+ v2 F6 T7 H1 C! ~1 E
ever, the family did not return for 4 months.% _; v9 H! y& C6 o3 c/ T; H j
Physical examination at this time revealed that the5 O! o4 Z! q) F3 T& D( u7 R
child had grown 2.5 cm in 4 months and had gained
. y$ s' Q$ R: }4 ^5 Q0 \+ W3 l0 Z0 O2 kg of weight. Physical examination remained! @* y7 {6 g5 P
unchanged. Surprisingly, the pubic hair almost com-
# v% X& B: O2 x7 K" a; B$ jpletely disappeared except for a few vellous hairs at% Z6 @( m' j2 f. w
the base of the phallus. Testicular volume was still 2
" P$ I, b) V! h+ XmL, and the size of the penis remained unchanged.
/ W3 L# c. {( r2 R) g3 H! SThe mother also said that the boy was no longer hav-
2 d7 Z0 V | {: x7 Z% n& D+ T1 i2 S, Y( ling frequent erections.
1 k. o7 G: m M9 P1 d& X |8 ~Both parents were again questioned about use of7 @) S# f. X7 I5 v& M0 L5 { {
any ointment/creams that they may have applied to$ v9 R! Q8 Y* u A m& E. J
the child’s skin. This time the father admitted the/ y8 B. d9 e4 `: q! O; P
Topical Testosterone Exposure / Bhowmick et al 541! M8 j8 x. p& _3 R
use of testosterone gel twice daily that he was apply-7 `$ j9 F" ?% p0 D( u- i! d
ing over his own shoulders, chest, and back area for* |( b" G2 @0 J$ h) |" a: ~8 N
a year. The father also revealed he was embarrassed
' Y. C3 K% n6 |5 Z7 q7 m' Oto disclose that he was using a testosterone gel pre-- n( T8 z. z- I
scribed by his family physician for decreased libido1 ?6 f' V1 h7 [7 d7 o7 A/ D
secondary to depression.
: G! e6 s, ~- b5 c6 `9 EThe child slept in the same bed with parents.
& ?% s* w6 _$ \" DThe father would hug the baby and hold him on his4 a K+ N; j( s5 [8 y
chest for a considerable period of time, causing sig-
9 N4 A. A+ w5 Z1 r* V) P$ Vnificant bare skin contact between baby and father.6 W5 F- u g1 i1 V3 l! b
The father also admitted that after the phone call,
, v2 j" O( T/ @when he learned the testosterone level in the baby0 s9 t. G" |! {; \8 B& R% L+ V
was high, he then read the product information
$ |. G( [# p3 s$ Ypacket and concluded that it was most likely the rea-
9 T) {9 s- `9 Gson for the child’s virilization. At that time, they
) W. q6 t' a4 L* V9 u4 P8 W& Vdecided to put the baby in a separate bed, and the
4 k, g, F8 `) a2 H- Xfather was not hugging him with bare skin and had
7 J4 Z/ m. Y" ~7 dbeen using protective clothing. A repeat testosterone
' D0 ]1 \# T0 G* ?, j. ttest was ordered, but the family did not go to the5 N7 S! D# [( R0 ?8 Z! f& t
laboratory to obtain the test.
7 S' @8 l) f+ jDiscussion4 G/ r: T8 W0 w' @2 N# S
Precocious puberty in boys is defined as secondary
/ z2 X5 Y$ ]+ b1 ], L( K# Rsexual development before 9 years of age.1,4' W, V, ^( q' L2 O: J
Precocious puberty is termed as central (true) when2 z+ \( o( K& F* P# k) V
it is caused by the premature activation of hypo-; B% o0 V$ M7 d: H
thalamic pituitary gonadal axis. CPP is more com-
. y- S/ r" l9 [/ D4 X' b* Hmon in girls than in boys.1,3 Most boys with CPP
* x! n( `* q4 o( q6 O5 g: Gmay have a central nervous system lesion that is6 v+ i/ o5 P* N* u) V6 s6 o/ \
responsible for the early activation of the hypothal-# e2 t& k9 {7 u$ l! i
amic pituitary gonadal axis.1-3 Thus, greater empha-, n- \6 {6 F/ `% [% O2 b$ E! g
sis has been given to neuroradiologic imaging in5 m. J; p* W8 m0 T- m* q
boys with precocious puberty. In addition to viril-$ [3 O7 q. g8 J6 T
ization, the clinical hallmark of CPP is the symmet-# y. w3 U, w4 K6 s: D. Q. l7 n2 u" B
rical testicular growth secondary to stimulation by
! y% P+ f. v: F2 N- mgonadotropins.1,3+ h" @0 k( |4 C; C) d7 h5 `
Gonadotropin-independent peripheral preco-
3 s2 E; N- `. z% O9 J5 U. S! Ocious puberty in boys also results from inappropriate
: U" j% w! h3 h4 gandrogenic stimulation from either endogenous or
6 ]; G+ j$ Y' v8 V+ H Yexogenous sources, nonpituitary gonadotropin stim-
- z3 @+ b6 I5 d, _ulation, and rare activating mutations.3 Virilizing4 D3 V) s, H4 z, Y/ f
congenital adrenal hyperplasia producing excessive; F& w" @! Y4 f g" z+ o
adrenal androgens is a common cause of precocious
) L: ?; S0 E4 T) Npuberty in boys.3,4) f6 D% r, T% p: ^% m# a$ j3 r
The most common form of congenital adrenal' t. G8 m8 l) e. z
hyperplasia is the 21-hydroxylase enzyme deficiency.! a7 B2 C$ v5 [' h# r j, L
The 11-β hydroxylase deficiency may also result in
1 [/ x3 d5 B: \; Vexcessive adrenal androgen production, and rarely,
4 B2 C( c$ \3 t( jan adrenal tumor may also cause adrenal androgen
$ h0 t: X; _$ v; cexcess.1,3$ E" J! L3 K4 {9 `. u
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
4 _ J" J- t$ x542 Clinical Pediatrics / Vol. 46, No. 6, July 20072 B6 ?& B3 }% }' X5 R, Q
A unique entity of male-limited gonadotropin-
) k/ W+ g, K* S, W" Xindependent precocious puberty, which is also known
$ j! o5 L1 w. E5 }as testotoxicosis, may cause precocious puberty at a$ K+ y x5 p* s0 y
very young age. The physical findings in these boys' N7 P% b9 U! s& p7 w+ x+ X' B
with this disorder are full pubertal development," i1 t: a- y: t( H, r5 Y1 L% _+ E
including bilateral testicular growth, similar to boys
, A' T* q( U( D" C' s- h' r C0 }! Bwith CPP. The gonadotropin levels in this disorder
2 N7 j; i* x8 u( [$ ^. @) E, ]are suppressed to prepubertal levels and do not show
, e: O$ f! n% D6 ^/ Z! H* L5 |8 bpubertal response of gonadotropin after gonadotropin-2 \$ a" ]# \3 u6 k9 v$ Z' m. T
releasing hormone stimulation. This is a sex-linked/ Y0 q0 A+ f8 L
autosomal dominant disorder that affects only
4 S7 q6 ]# z: V- xmales; therefore, other male members of the family
7 [: s* O# H' Imay have similar precocious puberty.3# S0 ~6 X) k/ m# ?9 P F
In our patient, physical examination was incon-
4 q7 z6 G% Y+ ?3 t" E7 _sistent with true precocious puberty since his testi-
. _$ _" N8 c) S% ycles were prepubertal in size. However, testotoxicosis
2 t# b( n# C+ n6 ^was in the differential diagnosis because his father$ W$ H) H0 x" W3 ~/ n
started puberty somewhat early, and occasionally,
, j* c7 x: X4 w. [* P- Rtesticular enlargement is not that evident in the- k) d& Q3 _* o5 X7 s! W6 m4 O, J1 J) E
beginning of this process.1 In the absence of a neg- F/ q1 i( s' Y/ B
ative initial history of androgen exposure, our
8 O/ k" c! K" pbiggest concern was virilizing adrenal hyperplasia,* ^6 ~+ q9 A: {( K" R
either 21-hydroxylase deficiency or 11-β hydroxylase
; S: l7 ?$ m7 P) |2 mdeficiency. Those diagnoses were excluded by find-7 h' J3 z4 g5 N4 V" M% J' n% j
ing the normal level of adrenal steroids.
5 Z* z8 y! a% _2 d! uThe diagnosis of exogenous androgens was strongly. b4 C2 F* l' J) i8 m+ V
suspected in a follow-up visit after 4 months because
; \4 T$ R+ B S* qthe physical examination revealed the complete disap-7 M. F3 ~" }( \$ `: |6 c2 y
pearance of pubic hair, normal growth velocity, and
: _. i' A, i1 U3 D. A! X9 ~decreased erections. The father admitted using a testos-
. m3 s- C5 T% a4 H* V4 C& d( P, q9 oterone gel, which he concealed at first visit. He was+ _/ h, t5 I, n9 j; }, Y
using it rather frequently, twice a day. The Physicians’
8 o! u) b- f3 |3 r0 h6 vDesk Reference, or package insert of this product, gel or5 b) O5 s) D" q
cream, cautions about dermal testosterone transfer to. f) | A; J0 x! s
unprotected females through direct skin exposure.
% i3 m9 u: h0 s- b" M; C2 DSerum testosterone level was found to be 2 times the- I. `8 Q6 n/ j' \, P) r
baseline value in those females who were exposed to
/ E( a0 I* i) {. r) s2 U- Deven 15 minutes of direct skin contact with their male6 m4 ~* j3 o! v( n2 g
partners.6 However, when a shirt covered the applica- _+ m- u: H5 f3 a3 x& L9 N
tion site, this testosterone transfer was prevented.
+ O/ C9 a- A0 E' n; mOur patient’s testosterone level was 60 ng/mL,; E3 y9 I% @1 c5 X
which was clearly high. Some studies suggest that' T/ `6 G6 I, x2 ~. r S8 R
dermal conversion of testosterone to dihydrotestos-* ]/ Q& Y# a. }" ]- p# a @
terone, which is a more potent metabolite, is more
- v. P1 v3 l5 K0 I& }6 cactive in young children exposed to testosterone
6 j+ O* q/ O) @- J1 A! j5 ^3 }exogenously7; however, we did not measure a dihy-# ?. l1 j+ d8 s. Y& Y1 o
drotestosterone level in our patient. In addition to i; P$ ^5 d1 O0 U6 s
virilization, exposure to exogenous testosterone in; M" ^$ v1 I8 o; }
children results in an increase in growth velocity and
) Y9 R# K4 ^ A2 Tadvanced bone age, as seen in our patient. E4 j1 q% V* c. W6 K* ~
The long-term effect of androgen exposure during$ M" `* u: `0 e; g0 g
early childhood on pubertal development and final. F$ s1 V# R8 @2 S( F
adult height are not fully known and always remain4 s8 H; X7 v [6 z
a concern. Children treated with short-term testos-& Q! l3 x) {/ w
terone injection or topical androgen may exhibit some f @$ p7 U' E( N4 e0 K
acceleration of the skeletal maturation; however, after- `' z: _/ Q' N& J, W
cessation of treatment, the rate of bone maturation4 \! ]) {/ {, w% }3 Q3 J3 ^
decelerates and gradually returns to normal.8,9 e+ \4 d/ j) h2 L8 k; u
There are conflicting reports and controversy6 C0 U; C* f% \$ U( I
over the effect of early androgen exposure on adult
% d/ q$ s* J/ y+ Gpenile length.10,11 Some reports suggest subnormal
) Q: P6 R7 m# ~7 u8 A3 @6 Badult penile length, apparently because of downreg-
# n3 x/ y$ c0 `ulation of androgen receptor number.10,12 However,
- |& d% z3 L) Y$ \" F" y0 LSutherland et al13 did not find a correlation between+ c6 Y( h' f/ A% ^2 Y3 U" `; _+ v
childhood testosterone exposure and reduced adult
u: [2 g' E# |7 Npenile length in clinical studies.
5 A* C! t2 q: A @: @Nonetheless, we do not believe our patient is! j8 \# o0 P9 T
going to experience any of the untoward effects from
- N) l+ R t( p" R8 \% D. P8 [% xtestosterone exposure as mentioned earlier because
" C7 T( u' O/ l4 b! |1 a: q3 rthe exposure was not for a prolonged period of time.) [9 U% T8 z( B3 J: R2 {
Although the bone age was advanced at the time of& H5 R4 Y$ O; N5 H5 N2 ^
diagnosis, the child had a normal growth velocity at
) J1 H2 I/ B" G- t7 R& }2 lthe follow-up visit. It is hoped that his final adult
: O6 J4 t* F" [# J ?3 U. z# lheight will not be affected.1 s* Q" j' R) Y: V1 ^* o& A8 {3 a( a
Although rarely reported, the widespread avail-- w. H! h: e: t% J+ p4 r
ability of androgen products in our society may
9 G# ]6 @. e* u$ y8 l5 Y8 F9 windeed cause more virilization in male or female: y& h% r8 i# y9 E% `+ e
children than one would realize. Exposure to andro-
. L$ w) B( L4 I& x5 _gen products must be considered and specific ques-
; @' ]& Q4 h( R) o0 L' i, r X8 htioning about the use of a testosterone product or
& w2 D' \) |9 C8 jgel should be asked of the family members during
. q3 c' F6 O9 \* {3 B/ k2 Wthe evaluation of any children who present with vir-0 p" d A' l0 h( T8 @5 x8 U
ilization or peripheral precocious puberty. The diag-
; ^; a: U' D- @4 p) f" [2 Q" Anosis can be established by just a few tests and by% N2 c9 e( w5 G8 r3 \8 O
appropriate history. The inability to obtain such a
3 l. _* {, \: _0 q3 j5 phistory, or failure to ask the specific questions, may0 a) h5 p- ~) L
result in extensive, unnecessary, and expensive
+ m9 q- Y% I4 L7 N& p! ^6 kinvestigation. The primary care physician should be% D, j# G) ^3 C% J
aware of this fact, because most of these children1 i5 k5 N5 y1 G" H3 h
may initially present in their practice. The Physicians’
2 R) o( C: y, P( f8 w: o1 ^Desk Reference and package insert should also put a
7 c; ~4 K( H6 [# Y7 z8 Y( Cwarning about the virilizing effect on a male or7 n6 n$ ?9 F, S
female child who might come in contact with some-$ ^9 H4 T- H5 a7 Q) g
one using any of these products.8 Z9 H, [6 p P/ ~
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1 [. d2 @$ l( I( V2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
! I* n+ A; f! T% l/ Tpuberty in children with tumours of the suprasellar pineal
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4 V( O& D+ Y% l4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual
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exposure to testosterone. Pediatrics. 1999;104:e23.. P7 Y8 o" O4 ~5 l" @
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- k% } | O2 w% X* i& _Stanford, CA: Stanford University Press; 1959.
/ T. L- F' [4 l% ]9 N; N6. Physicians’ Desk Reference. Androgel 1% testosterone,! A9 G5 b: P4 g7 S
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