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is a significant concern for physicians. Central2 M2 d6 K3 g# \( H" D' O# T
precocious puberty (CPP), which is mediated+ G; e E# L& [: d" R+ x
through the hypothalamic pituitary gonadal axis, has
^& x# K/ S( ba higher incidence of organic central nervous system4 H5 s3 Q6 |' R8 I
lesions in boys.1,2 Virilization in boys, as manifested3 }! z6 T/ i0 i
by enlargement of the penis, development of pubic' a- w& g1 T& x" \) G: m
hair, and facial acne without enlargement of testi-) D4 r3 n; f6 R
cles, suggests peripheral or pseudopuberty.1-3 We
9 W' ?& a7 y" R, b* d8 l5 A0 ~" Preport a 16-month-old boy who presented with the
7 S- ?3 F) G: ^( Benlargement of the phallus and pubic hair develop-; _, e' P& e7 A" t
ment without testicular enlargement, which was due
; m/ v1 [; g) `+ Y* {to the unintentional exposure to androgen gel used by
7 O- U# V! g% y6 p' X* zthe father. The family initially concealed this infor-7 M' F. j3 e" O
mation, resulting in an extensive work-up for this3 R+ [; l* @% z. u3 I
child. Given the widespread and easy availability of% j7 r( m" \* i$ |' w4 h: g* L
testosterone gel and cream, we believe this is proba-
6 R8 q+ r* y2 E5 n4 k7 y* cbly more common than the rare case report in the
8 W$ p9 z+ `" z: _# Oliterature.4$ a2 Y$ d) C- Y5 H$ h
Patient Report) d+ k4 x# k2 z
A 16-month-old white child was referred to the% x5 }8 u5 w3 s* R- @. A
endocrine clinic by his pediatrician with the concern
+ o2 {. G% _$ w M5 kof early sexual development. His mother noticed7 Q3 k: a1 t/ X
light colored pubic hair development when he was
. d/ E, I# W+ [' ?From the 1Division of Pediatric Endocrinology, 2University of4 q1 g* q$ D+ Y& Q3 ]) n( k
South Alabama Medical Center, Mobile, Alabama.
- ~# G$ X q/ A3 H1 b, A4 ]1 jAddress correspondence to: Samar K. Bhowmick, MD, FACE,
1 w' S3 }+ j6 I, DProfessor of Pediatrics, University of South Alabama, College of" A* y+ v! K, k
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
7 |4 G! R# }2 [# K3 L5 e! }e-mail: [email protected].6 y5 `6 N9 R: l5 v$ F; {
about 6 to 7 months old, which progressively became
. a4 k {& C- [, R3 V; L2 ^darker. She was also concerned about the enlarge-
1 B& Y7 |! ?5 z% [% o" Kment of his penis and frequent erections. The child
& w* ], N" |$ D* W" Ewas the product of a full-term normal delivery, with% u- k1 s, X1 A* C% K
a birth weight of 7 lb 14 oz, and birth length of
+ R5 ]4 _; R. ^9 {9 Z. W20 inches. He was breast-fed throughout the first year
) t' [% S n) f7 Zof life and was still receiving breast milk along with
l2 x- r" [5 G+ Y1 k& tsolid food. He had no hospitalizations or surgery,
8 h+ N4 k( p2 V( Wand his psychosocial and psychomotor development
( o- k4 h4 D) x* M1 r* ?was age appropriate.( B- E' B; Y% |# j! ~* H! \
The family history was remarkable for the father,/ {# G& G9 `) t B/ ~' P
who was diagnosed with hypothyroidism at age 16,8 _% C7 N" G4 P$ n; q1 G
which was treated with thyroxine. The father’s) \0 o. ]6 X* |7 O+ m
height was 6 feet, and he went through a somewhat: s# S& J6 @' I2 k
early puberty and had stopped growing by age 14.
' K( L. m! i8 M3 ]# ^) @The father denied taking any other medication. The2 X5 w1 [6 Z+ B5 W. Q1 i
child’s mother was in good health. Her menarche
# O: Z$ r. R2 n3 g- mwas at 11 years of age, and her height was at 5 feet
" A6 ?3 L2 M* z) U/ e5 inches. There was no other family history of pre-
0 ]% {2 y6 @9 u4 f) I$ @$ J2 X5 R/ A! ococious sexual development in the first-degree rela-1 i: K# @2 |7 R- E5 @* `
tives. There were no siblings.
& L e2 m* a; A+ n e* qPhysical Examination$ U* h: @# u( l5 U& C
The physical examination revealed a very active,/ P# }3 C" |2 W
playful, and healthy boy. The vital signs documented
9 P; n0 n6 Z! o/ f8 F3 @. b2 Wa blood pressure of 85/50 mm Hg, his length was7 ]( F3 t2 [5 \# C9 q6 X
90 cm (>97th percentile), and his weight was 14.4 kg9 b- M3 s4 |6 u) H: l; @. W# W7 p. `! v
(also >97th percentile). The observed yearly growth; R4 Z: L( w7 p! ?$ b2 K
velocity was 30 cm (12 inches). The examination of! j0 |$ I8 N/ {
the neck revealed no thyroid enlargement.7 M; `9 t& U$ E# G" Q& a
The genitourinary examination was remarkable for v* l% q; S2 v* h) [1 U% `
enlargement of the penis, with a stretched length of( {; V& F6 j8 v' @8 P! u% ~# i$ C
8 cm and a width of 2 cm. The glans penis was very well$ e7 h) t( R7 Y! M- W
developed. The pubic hair was Tanner II, mostly around
% v9 O% Z0 `7 n4 m8 Q540
2 F' x8 ?8 b+ j/ [at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
5 M2 X( b+ {. _the base of the phallus and was dark and curled. The
! N6 j: c; @- c( \* jtesticular volume was prepubertal at 2 mL each.
4 W" e# u5 C* \( l6 a% Q$ t. oThe skin was moist and smooth and somewhat
4 `$ b5 l; l* W- Xoily. No axillary hair was noted. There were no
; `6 u. s8 K, c# Babnormal skin pigmentations or café-au-lait spots.* C( @6 p' Y2 q* @* _
Neurologic evaluation showed deep tendon reflex 2+
& m. M( n$ g3 u3 N- L4 tbilateral and symmetrical. There was no suggestion+ B1 W$ n! p: b( L
of papilledema.
s6 B( k: q7 I7 s5 e# dLaboratory Evaluation; t, e- y0 R- N5 ]( s
The bone age was consistent with 28 months by
, {! W3 L( e8 }6 S/ Qusing the standard of Greulich and Pyle at a chrono-6 y8 h! n I; S0 `# ]* _
logic age of 16 months (advanced).5 Chromosomal& u2 k2 e" \' z8 l% Z; q/ {6 n
karyotype was 46XY. The thyroid function test
; T2 q8 g0 j: b+ I- c# ^showed a free T4 of 1.69 ng/dL, and thyroid stimu-
( T6 H& u$ L! i! |( H1 llating hormone level was 1.3 µIU/mL (both normal).9 W2 b- W8 i6 b! }1 o4 S* Q
The concentrations of serum electrolytes, blood
' h! n7 F. g, v) X5 ]urea nitrogen, creatinine, and calcium all were
. B7 f) z9 t9 P1 Kwithin normal range for his age. The concentration
$ ^3 K) U7 x5 y' G6 Sof serum 17-hydroxyprogesterone was 16 ng/dL
9 g7 C. x5 H b/ i2 d, @(normal, 3 to 90 ng/dL), androstenedione was 20
9 L. u# h/ E8 E/ P% V+ [ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
9 l" H0 L# R7 i7 vterone was 38 ng/dL (normal, 50 to 760 ng/dL),
! \1 C3 [" x9 n5 m/ R) M% m# w8 odesoxycorticosterone was 4.3 ng/dL (normal, 7 to
0 ? {. [4 g% N0 o. V: s49ng/dL), 11-desoxycortisol (specific compound S)
( Q) d* `- c, w |7 G3 dwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-! T/ y$ |! X6 V; o) z% e& f
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total( m/ s& k; X$ n" z) q; e& e% I
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),% U# p* I; g) P* F
and β-human chorionic gonadotropin was less than
0 [* v: L6 r* ]5 mIU/mL (normal <5 mIU/mL). Serum follicular
% y' {! v2 C/ L" Cstimulating hormone and leuteinizing hormone7 Q4 U5 b; |3 F- G
concentrations were less than 0.05 mIU/mL( w" x L" H5 M7 A" `/ F0 n: M
(prepubertal).
) S5 C' B& Q: n$ b9 T7 \: [2 \2 DThe parents were notified about the laboratory
* H: f2 X1 A Q( I% }* e& Lresults and were informed that all of the tests were
, H$ r5 d( ~" w+ U- C1 l6 t4 inormal except the testosterone level was high. The+ R* N7 V$ j( V- A' }% K
follow-up visit was arranged within a few weeks to! D- T$ X0 }" b5 j' F7 {9 i e
obtain testicular and abdominal sonograms; how-
; m9 E4 R9 i ~' X6 M l. R" t0 zever, the family did not return for 4 months., w1 {( [1 ^% R+ s
Physical examination at this time revealed that the9 F; a e: [# ~% [2 ]( j: i$ `
child had grown 2.5 cm in 4 months and had gained
( {! m8 e* z. I! B5 G0 v2 kg of weight. Physical examination remained
5 x- z8 j: z" l% V- s6 Dunchanged. Surprisingly, the pubic hair almost com-
& l1 [6 r! _+ X- m$ X8 Z) A N8 Npletely disappeared except for a few vellous hairs at
$ g* I& U- Q- k& Hthe base of the phallus. Testicular volume was still 2' `6 Y- n* Y u7 t. Q
mL, and the size of the penis remained unchanged.$ o: r& v7 O4 Y1 }
The mother also said that the boy was no longer hav-
2 O, G) z7 `; I% A* z' C& {ing frequent erections. H5 X* K9 f3 y" j8 n2 Y
Both parents were again questioned about use of
- F! j9 | u7 v1 Y/ U/ ^+ \any ointment/creams that they may have applied to8 |9 C4 Q4 K% ^# l; D
the child’s skin. This time the father admitted the
2 X. G& t0 o. ZTopical Testosterone Exposure / Bhowmick et al 541) E* q; j8 y( k- X. ~
use of testosterone gel twice daily that he was apply-
6 n6 h/ W. \7 ]* C qing over his own shoulders, chest, and back area for# J" D* r$ Y. ^$ Q8 o4 X; p% A. T, X
a year. The father also revealed he was embarrassed1 j" i1 W3 x. f0 }. Y, Y: d/ ~
to disclose that he was using a testosterone gel pre-7 M4 |+ X* J4 }5 I* Y- g/ W- r
scribed by his family physician for decreased libido& a# X% l2 c9 w4 o9 K
secondary to depression.
8 \$ K ?* I/ z3 J6 RThe child slept in the same bed with parents.) r7 D! F' N- G
The father would hug the baby and hold him on his
. ^/ \5 c4 [# d1 Y; f3 J. I9 _chest for a considerable period of time, causing sig-- ?: q# g7 }6 f2 d% u' j3 [/ I/ V
nificant bare skin contact between baby and father.! t$ U' _2 v: {2 Q( ?( W0 b
The father also admitted that after the phone call,
( s h( n$ [3 [) t9 W0 ~- D4 Zwhen he learned the testosterone level in the baby
- M* K. j! x4 [( q6 gwas high, he then read the product information, A$ k, b n/ l; ?* ~) y
packet and concluded that it was most likely the rea-6 ~; O, q' d- w
son for the child’s virilization. At that time, they6 L2 r/ B4 C# ?5 Y3 Y: h N8 ~
decided to put the baby in a separate bed, and the3 Z& l" [: l/ v. }2 Y
father was not hugging him with bare skin and had
# a% t5 S) _9 Obeen using protective clothing. A repeat testosterone
7 ?+ g3 ]' [7 F* K& _9 Ztest was ordered, but the family did not go to the" A+ H5 M) o; ~, a1 e' A2 p7 D
laboratory to obtain the test.2 A; f* n7 Z- r# w' b
Discussion
9 Y4 o8 J6 r) }5 P8 a& YPrecocious puberty in boys is defined as secondary
; m7 p+ {: v0 }% X3 R6 bsexual development before 9 years of age.1,4
' f5 X( f- B9 B8 r. r7 GPrecocious puberty is termed as central (true) when7 @3 K o' @$ t. ]+ E
it is caused by the premature activation of hypo-* o9 H" I7 l6 }" v4 |" C
thalamic pituitary gonadal axis. CPP is more com-5 f( w! h/ d# z
mon in girls than in boys.1,3 Most boys with CPP
* B5 y1 G: C) K) |2 M1 K8 jmay have a central nervous system lesion that is
* o; O& B# d r3 ~, e9 Q, @$ g8 `. presponsible for the early activation of the hypothal-
2 j2 P0 e4 x' `2 W3 j, y5 ?amic pituitary gonadal axis.1-3 Thus, greater empha-8 |5 x8 F; R; j1 l/ }5 S
sis has been given to neuroradiologic imaging in% T7 v5 W2 U: h4 |6 ~# J6 [
boys with precocious puberty. In addition to viril-
4 v# |/ C" }& @0 K2 eization, the clinical hallmark of CPP is the symmet-
$ e4 m& n- P" [) a1 s! qrical testicular growth secondary to stimulation by ^$ [% e- b9 b* |, O' m2 Y) D* j
gonadotropins.1,3
1 d% I# U4 O5 P4 e9 t9 {Gonadotropin-independent peripheral preco-) E' g, g% W$ n+ m
cious puberty in boys also results from inappropriate
+ d# p/ T( R" s2 g; f/ m; m$ }4 Aandrogenic stimulation from either endogenous or
: |6 P" G4 B7 D8 G3 P- b, X4 S: e- t% mexogenous sources, nonpituitary gonadotropin stim-
7 E: p( {( l Z5 s3 [* d4 xulation, and rare activating mutations.3 Virilizing/ d0 y5 N% s2 x6 H k
congenital adrenal hyperplasia producing excessive" [: I3 y9 F' l. }2 I6 ]$ ~
adrenal androgens is a common cause of precocious
. g: ^4 ]- m3 c3 \, [1 A, opuberty in boys.3,41 f3 i; Y( x- O/ C5 M! M; C8 W3 \' t. A9 Y
The most common form of congenital adrenal
9 ^4 X# b9 g! Phyperplasia is the 21-hydroxylase enzyme deficiency.
, d9 }* I! h2 r+ w5 @/ KThe 11-β hydroxylase deficiency may also result in u. d: g8 y: u
excessive adrenal androgen production, and rarely,( n; H; W# R: s0 H( |8 A* K0 B3 U
an adrenal tumor may also cause adrenal androgen: e& X7 j( s, `. @$ l; |
excess.1,3
3 k/ r! ^, B+ Qat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
5 e8 a/ n* r) ]% K! I3 D542 Clinical Pediatrics / Vol. 46, No. 6, July 2007 b3 q7 o; b# l) K' q( ]" ~, P8 i3 G
A unique entity of male-limited gonadotropin-, k$ y( B. i4 ?+ ?
independent precocious puberty, which is also known
( x" u) {8 u4 Z( i- K; O; Eas testotoxicosis, may cause precocious puberty at a z4 P: V" n. @" t7 W; M
very young age. The physical findings in these boys
" x: C/ i, p0 X) P6 M3 z& Twith this disorder are full pubertal development,8 j, O# k2 Z; I/ l
including bilateral testicular growth, similar to boys2 u' X# t1 ?8 w B+ q4 E; ?4 N3 o
with CPP. The gonadotropin levels in this disorder
7 U" D# `* M6 L' Vare suppressed to prepubertal levels and do not show8 e, h: N! n8 R/ z
pubertal response of gonadotropin after gonadotropin-
7 n2 l0 C, K9 b$ g* A- Greleasing hormone stimulation. This is a sex-linked6 S( G: o8 f8 @& H% a
autosomal dominant disorder that affects only- w4 ]( T* q0 u& D/ H
males; therefore, other male members of the family3 r* `* _; B* ]8 E
may have similar precocious puberty.3
. l0 X" [- s" b0 @( p2 z: N2 fIn our patient, physical examination was incon-' m2 p6 Z0 g) S U+ }* H
sistent with true precocious puberty since his testi-* S. O& S w) h8 U/ ?8 x9 s8 o
cles were prepubertal in size. However, testotoxicosis. b/ p# I# |9 w) ?
was in the differential diagnosis because his father
0 x' V! v/ Q) ?2 L( a, _8 S- w" Estarted puberty somewhat early, and occasionally,; g) j2 O; V O! {
testicular enlargement is not that evident in the# ~9 ?# C4 |: \& L, t) d+ P
beginning of this process.1 In the absence of a neg-/ l- V4 [+ P8 x) T5 {
ative initial history of androgen exposure, our
- o9 p* U2 a& f# c% `biggest concern was virilizing adrenal hyperplasia,
# [. Q7 O& Q2 D- p) Ueither 21-hydroxylase deficiency or 11-β hydroxylase# ^1 {6 E, I+ R9 M/ a: A
deficiency. Those diagnoses were excluded by find-
- M1 P% W( X4 |# w. ving the normal level of adrenal steroids.' H3 Y9 F0 o8 }% f) l: G6 H( o
The diagnosis of exogenous androgens was strongly
; o9 i& x; b4 |# p- ksuspected in a follow-up visit after 4 months because8 P' c3 @% u- ^+ B% S; l
the physical examination revealed the complete disap-0 R$ P2 w4 }" x
pearance of pubic hair, normal growth velocity, and P* t* R$ \3 D/ L; n% P1 W
decreased erections. The father admitted using a testos-
; o$ W4 H# j" \& bterone gel, which he concealed at first visit. He was
' c# r% O6 N0 X1 susing it rather frequently, twice a day. The Physicians’" z( M; S# g& l+ z; c( Y. T: @
Desk Reference, or package insert of this product, gel or
5 F* P' ]! `: m3 W7 M% V( icream, cautions about dermal testosterone transfer to
. G( |, O# ]4 \unprotected females through direct skin exposure. }* |: T- f& K
Serum testosterone level was found to be 2 times the
0 Z3 Q/ k) G& p) t# ?9 qbaseline value in those females who were exposed to. L/ G; W4 w) L! c6 i6 d2 W
even 15 minutes of direct skin contact with their male5 O, D, G1 h. j% G) k5 l0 @+ ]
partners.6 However, when a shirt covered the applica-3 a$ Y+ E5 i1 f/ w$ k9 \
tion site, this testosterone transfer was prevented.
) H7 K' S4 O3 j+ @% J" BOur patient’s testosterone level was 60 ng/mL,
7 [) [& ^. U$ A% d0 Iwhich was clearly high. Some studies suggest that1 g% a1 F t$ ~' [ H1 R
dermal conversion of testosterone to dihydrotestos-
* D* S5 l7 @4 K5 Z* S( eterone, which is a more potent metabolite, is more4 w. c4 Q, d- z8 R1 n% K o
active in young children exposed to testosterone
8 R+ M9 X6 E6 \# d- Z- c+ texogenously7; however, we did not measure a dihy-! O9 j+ Y( w- k3 J$ q
drotestosterone level in our patient. In addition to
, f0 F; s3 @- W; L. k1 Q" r- S, qvirilization, exposure to exogenous testosterone in+ |! k' k u: x- ^8 h) g9 @2 d" A
children results in an increase in growth velocity and; L, ]$ c! [ L3 ]( O6 ~+ O
advanced bone age, as seen in our patient.0 t8 O& ^8 J% U0 P
The long-term effect of androgen exposure during
9 {8 [. G0 N( k. T7 vearly childhood on pubertal development and final
: i6 D) }- W! s- u5 ?' W; v6 d0 Oadult height are not fully known and always remain" O; T. T/ l( z1 |/ d
a concern. Children treated with short-term testos-
" V" m5 A1 N3 G8 `6 l# }: K9 v, b0 Xterone injection or topical androgen may exhibit some
6 x% a) Y9 Z0 T3 w! e8 r, Eacceleration of the skeletal maturation; however, after
0 U" b; l2 s$ E* A! x& e1 e2 Tcessation of treatment, the rate of bone maturation9 c" p8 ]& U; w* ?3 ^7 I( W0 K# C
decelerates and gradually returns to normal.8,96 r* y% M3 h: c
There are conflicting reports and controversy t9 E- [% n# |/ S6 a& x( E
over the effect of early androgen exposure on adult
6 H9 D& m, b6 y0 G. ]4 a/ L p* {& Vpenile length.10,11 Some reports suggest subnormal. F) r; G5 F* }4 _
adult penile length, apparently because of downreg-) z/ X- C P. j2 V3 p1 Q. v
ulation of androgen receptor number.10,12 However,
/ u) u R2 D8 ]" u# |& zSutherland et al13 did not find a correlation between
8 Y9 }2 c3 r( E/ B' fchildhood testosterone exposure and reduced adult
+ J3 @8 C+ _0 X9 ]: p6 P Fpenile length in clinical studies.+ H% o7 B) l3 n# C& Y
Nonetheless, we do not believe our patient is
7 r! \9 j$ R8 ^going to experience any of the untoward effects from
- H( a- g# g4 J- z) _$ [testosterone exposure as mentioned earlier because
6 O3 T8 D# Y6 b) Y( p' x& C& `. bthe exposure was not for a prolonged period of time.: E& o9 |, U4 @6 H) U# n
Although the bone age was advanced at the time of
! d6 d- Q+ B# e3 F* adiagnosis, the child had a normal growth velocity at6 H( T7 |, G; ?
the follow-up visit. It is hoped that his final adult
6 Z% M3 F' V7 Q7 y! }* T. B6 gheight will not be affected.+ \. e) ~+ D$ X+ r7 r! d' Y( B
Although rarely reported, the widespread avail-
! R: t/ \# D& G( Xability of androgen products in our society may
2 w3 }8 l$ Q8 `" @. Yindeed cause more virilization in male or female% W2 D/ M. G( U3 |9 Y" G3 V9 \
children than one would realize. Exposure to andro-
- u: O5 P; Z0 d0 W' X/ v# e7 Egen products must be considered and specific ques-
- p- U1 i- s5 N3 @! Z& a; o' ]3 btioning about the use of a testosterone product or
( J8 B w8 q" g& n% [$ c3 Agel should be asked of the family members during! v0 Y! |/ C* a5 Q, ~5 g2 ?
the evaluation of any children who present with vir-# ~/ O7 i$ F& [
ilization or peripheral precocious puberty. The diag-( h7 O" a* y \9 O6 ^: @: c
nosis can be established by just a few tests and by* L' B1 d! z& a) { x
appropriate history. The inability to obtain such a
4 Y5 E' ~: \! r2 U1 B. W+ nhistory, or failure to ask the specific questions, may8 R- D2 N5 r! ]5 m7 f) g
result in extensive, unnecessary, and expensive1 [5 h9 i/ r. |( P1 d( N
investigation. The primary care physician should be
- M1 ]/ w7 _( i" F/ Uaware of this fact, because most of these children
& y' \: h3 H' Lmay initially present in their practice. The Physicians’& h; k9 D; v, H: R ~8 i! S
Desk Reference and package insert should also put a
/ J% Z( d9 r1 Dwarning about the virilizing effect on a male or
% W' O7 r3 ]3 t0 q8 s, ]3 Rfemale child who might come in contact with some-0 L; h( _/ v$ ~! ]0 d5 m1 h/ {. e- v
one using any of these products.: M% V5 K5 h9 W0 A% s$ e5 M7 S
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+ ?' O& A$ S* {7 s, X3 \7 M7 U0 s4 Yareas: organic central precocious puberty. Acta Paediatr.
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Pediatric Endocrinology. 4th ed. New York, NY: Marcel
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development in a two-year-old boy induced by topical
# g4 m0 A6 e3 {9 A/ ?exposure to testosterone. Pediatrics. 1999;104:e23.0 H0 }% t$ v, l) ^
5. Greulich WW, Pyle SI, eds. Radiographic Atlas of
# [& V4 n3 V, c) d- ?1 LSkeletal Development of the Hand and Wrist. 2nd ed.# n% Z! n! [* Z' B0 x$ k3 K
Stanford, CA: Stanford University Press; 1959.+ B& A0 I% q4 T
6. Physicians’ Desk Reference. Androgel 1% testosterone,
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