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is a significant concern for physicians. Central
; N) Q: Y6 y$ Sprecocious puberty (CPP), which is mediated& K g$ O4 M8 z, s# b. R$ Q8 V9 c8 V
through the hypothalamic pituitary gonadal axis, has- G& h2 T2 R0 I
a higher incidence of organic central nervous system& T6 r% g/ w8 \; c: @4 F) u" X
lesions in boys.1,2 Virilization in boys, as manifested
8 D; i' N/ [# b3 D+ C& uby enlargement of the penis, development of pubic
0 `5 ?4 \. D/ k* J( f) Khair, and facial acne without enlargement of testi-
% }2 m: u0 K; G1 P( c; R/ jcles, suggests peripheral or pseudopuberty.1-3 We+ U' A g3 Y- \9 G8 m1 ^
report a 16-month-old boy who presented with the
$ l. l3 L/ N- {; Genlargement of the phallus and pubic hair develop-$ M! F, X: V4 R( P
ment without testicular enlargement, which was due* C, ] O; K* r; {
to the unintentional exposure to androgen gel used by
% m& x1 X3 Q/ m: F- K8 ?* Wthe father. The family initially concealed this infor-
' b* L. A( _& a7 s. q+ C5 v3 \mation, resulting in an extensive work-up for this7 c* w$ R8 D& S5 z& T0 ~% _1 T& q
child. Given the widespread and easy availability of) Y* t1 r/ r/ G2 f
testosterone gel and cream, we believe this is proba-( E- R3 j( H2 s! y, q8 K
bly more common than the rare case report in the
7 t. U4 g4 z5 f" D7 D4 Rliterature.4
9 b# Y, D. X6 X: c4 SPatient Report, w1 N9 n: s* h$ m
A 16-month-old white child was referred to the
7 h, b! \) @: Z9 u) G7 eendocrine clinic by his pediatrician with the concern; E9 f6 I: L9 y: H* n1 d, v! n
of early sexual development. His mother noticed" v$ g* s& b: |; K# v& U& {
light colored pubic hair development when he was9 S5 @4 P# y" [9 R" u8 K: c
From the 1Division of Pediatric Endocrinology, 2University of
6 Y' n- H8 Q; B v, `, v: f5 Q# d, ?South Alabama Medical Center, Mobile, Alabama.& {4 \& ?; T6 Z2 x5 b3 x: |, I! G
Address correspondence to: Samar K. Bhowmick, MD, FACE,
2 M: Z( i o3 d4 t& H/ u, hProfessor of Pediatrics, University of South Alabama, College of! r: E7 c# t0 z* n/ o7 D, @
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;( o, s3 T# R9 k: G% k% h* B6 z9 y
e-mail: [email protected].$ I o5 h+ s- S; `0 b
about 6 to 7 months old, which progressively became
; l) i6 I- _7 }9 Z- cdarker. She was also concerned about the enlarge-
5 ?& r( |4 U/ L6 O k+ \ment of his penis and frequent erections. The child
" I! t4 |9 V$ dwas the product of a full-term normal delivery, with
0 v5 f5 P Y2 R# g6 g' va birth weight of 7 lb 14 oz, and birth length of; i2 Z+ {3 O; i# J9 r
20 inches. He was breast-fed throughout the first year
8 F, h6 M% H2 R6 ?1 }of life and was still receiving breast milk along with
( T+ d# C+ d4 {& ssolid food. He had no hospitalizations or surgery,# F0 m2 P, K" a1 Z
and his psychosocial and psychomotor development$ S$ |$ R! _0 \4 }
was age appropriate.
+ f2 Z" S1 k6 @! p- j1 z- x' g; A" kThe family history was remarkable for the father,
1 m+ W! x6 T3 G& D+ V1 i# Cwho was diagnosed with hypothyroidism at age 16,
# p9 }: W, \ @8 z w5 uwhich was treated with thyroxine. The father’s
/ c* m. v) x) ]7 V6 P* ^: bheight was 6 feet, and he went through a somewhat3 C* K$ p" f7 M) e5 m
early puberty and had stopped growing by age 14.! v; }# ^- ?0 Q
The father denied taking any other medication. The
: V- D' g8 l4 V8 W3 C$ A8 a2 c& Ochild’s mother was in good health. Her menarche5 i- g! U6 J5 L* K2 T* Y- N
was at 11 years of age, and her height was at 5 feet
5 K- \4 q9 ^. e% o9 \5 inches. There was no other family history of pre-
" R7 R$ t* d) @cocious sexual development in the first-degree rela-
* S( D( n+ Z' [" G3 B' v* q- rtives. There were no siblings.- [- G- u% [4 k2 U I
Physical Examination
( t9 _4 z' V* Q- j: UThe physical examination revealed a very active,
! \7 d: m4 ^1 _# e2 Rplayful, and healthy boy. The vital signs documented2 n/ B9 P" j6 A; S1 P4 w* m2 q% J
a blood pressure of 85/50 mm Hg, his length was; [1 W) {6 R5 o* ]+ D4 W2 [
90 cm (>97th percentile), and his weight was 14.4 kg
' n" V9 `- x4 \3 F3 m4 L4 F! @(also >97th percentile). The observed yearly growth" b7 X. v3 R$ P9 T% w. t0 p: b' [
velocity was 30 cm (12 inches). The examination of$ K% k2 ]! n6 v9 X5 \+ i* X
the neck revealed no thyroid enlargement.
( i- z* w( y, J' h$ a- xThe genitourinary examination was remarkable for
0 q9 G8 X. g+ M& }: Z5 Aenlargement of the penis, with a stretched length of8 D+ G4 \9 C/ W- a3 y/ @
8 cm and a width of 2 cm. The glans penis was very well! ~2 u# P# L) g! ?( t7 u% r
developed. The pubic hair was Tanner II, mostly around7 f" w' T: }% H' D! F6 L6 P
540
! K8 e, J# ?- \9 p& x# lat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
$ M: M$ N1 y3 S$ Wthe base of the phallus and was dark and curled. The
8 S/ w5 E$ ?, \+ n& b& D6 mtesticular volume was prepubertal at 2 mL each.
9 R! X: O% a9 W! m: k- L7 QThe skin was moist and smooth and somewhat
% I, A# h# }! g* C/ F8 \oily. No axillary hair was noted. There were no# l) e) Q/ c' i8 E' b3 e8 v M
abnormal skin pigmentations or café-au-lait spots./ p4 Q! V4 n/ H0 P/ T2 ~
Neurologic evaluation showed deep tendon reflex 2+3 ]1 j6 E; k+ C8 e1 M+ ~
bilateral and symmetrical. There was no suggestion8 d# |$ z. w. `8 z0 J
of papilledema.
2 T) x$ c* G( H4 x' _) q- l* OLaboratory Evaluation
' B& a' X% {1 `% n4 } qThe bone age was consistent with 28 months by
0 i2 c5 c6 S# }8 c/ u* u( Ausing the standard of Greulich and Pyle at a chrono-* |. @* b. H* X( V& [7 M' l
logic age of 16 months (advanced).5 Chromosomal$ e+ }0 _: e9 M, S5 S3 t* ~) B
karyotype was 46XY. The thyroid function test
% Z, N( z' D5 hshowed a free T4 of 1.69 ng/dL, and thyroid stimu-
( @! f9 H' o. Y* a) _lating hormone level was 1.3 µIU/mL (both normal).. S7 U9 E& {# I3 X6 s0 F# \
The concentrations of serum electrolytes, blood( M t7 }( A$ b" r' _4 n/ K+ G
urea nitrogen, creatinine, and calcium all were
& y* i5 Z: c$ q1 E9 \within normal range for his age. The concentration
. V. z8 U# i/ {; `5 R+ D4 Rof serum 17-hydroxyprogesterone was 16 ng/dL. G- [1 S) |$ }3 I
(normal, 3 to 90 ng/dL), androstenedione was 20. t1 I3 \7 {0 V% ~7 b7 P6 X
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
# D& o& ]) _2 s# t7 i hterone was 38 ng/dL (normal, 50 to 760 ng/dL),
' V& {# J. l, Rdesoxycorticosterone was 4.3 ng/dL (normal, 7 to, x |5 V- t- P' _6 K
49ng/dL), 11-desoxycortisol (specific compound S)
/ B8 H$ F# z3 F! J+ m, X& D h Twas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
# p, X1 T: I! z7 Dtisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total! ?! g! @8 _& c" s+ @
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),4 n1 p' M p) p/ ] w- Q
and β-human chorionic gonadotropin was less than
% J5 Q0 z# _* A, F9 T) [" h5 mIU/mL (normal <5 mIU/mL). Serum follicular" Z6 v- D4 V8 z5 R6 Q% j4 e
stimulating hormone and leuteinizing hormone
: [9 ^& D) x. h; \+ hconcentrations were less than 0.05 mIU/mL
K# T, T' o5 f(prepubertal).: Z- _" L& t5 s4 D, F
The parents were notified about the laboratory
/ V- c i2 D2 Tresults and were informed that all of the tests were6 {) ~" `/ k# d; M
normal except the testosterone level was high. The' N) t f" r2 g% Y) ^
follow-up visit was arranged within a few weeks to
6 R2 [; e0 b/ _5 vobtain testicular and abdominal sonograms; how-% }, l8 T6 q: e8 m% I/ Q( a7 u5 o
ever, the family did not return for 4 months.0 V+ ?. Q% m0 N" _8 ~4 ?- W. u
Physical examination at this time revealed that the& ?! c w( [5 b
child had grown 2.5 cm in 4 months and had gained3 J# p! M& Z7 Q: S5 G4 D
2 kg of weight. Physical examination remained0 ]0 V6 S4 d& X( P: r. T& B
unchanged. Surprisingly, the pubic hair almost com-
" _% {4 ?( W; x/ Q( i' C7 ~% ipletely disappeared except for a few vellous hairs at
; A( C' @( }% Q& R5 ^( E# Fthe base of the phallus. Testicular volume was still 20 q, g# H0 s' Q( Q3 k( C
mL, and the size of the penis remained unchanged., F! |( i# R" h) m) E) G3 I& l9 o
The mother also said that the boy was no longer hav-
" C& v3 n1 k P) a4 _ing frequent erections.
9 I/ x" s; }5 Q. q- pBoth parents were again questioned about use of
: S% ?7 u' z: h. o4 uany ointment/creams that they may have applied to
, {$ r3 O4 G' i% Sthe child’s skin. This time the father admitted the
1 W2 ?. w+ A) ]. B* f& I: HTopical Testosterone Exposure / Bhowmick et al 541
" g- ]3 \% X- b/ j' M" y: quse of testosterone gel twice daily that he was apply-" T% p! y9 U$ |( z6 I
ing over his own shoulders, chest, and back area for8 |9 `9 `' M, ]9 d
a year. The father also revealed he was embarrassed; P9 ~0 f$ n2 R$ N5 I+ _
to disclose that he was using a testosterone gel pre-1 ]& A- o7 b, Q9 f# q% E
scribed by his family physician for decreased libido
* D( `- v" g- f: ksecondary to depression.' Y9 ?2 x1 \$ X M3 v9 i2 a
The child slept in the same bed with parents.% ~' K1 y: k" @1 c5 H+ M
The father would hug the baby and hold him on his
$ A n, f# g0 N5 ^$ Y5 C, ]& @! Qchest for a considerable period of time, causing sig-% O4 L6 X ]' j
nificant bare skin contact between baby and father.
8 ~- f4 k8 x, ]$ NThe father also admitted that after the phone call, ?7 Q5 @; m6 f4 _: e2 W; T
when he learned the testosterone level in the baby' j2 ~( e2 }8 p* G, d
was high, he then read the product information
$ B( [/ g4 B8 H9 ], }. dpacket and concluded that it was most likely the rea-/ \) I: j2 V Q& U) j9 O) C7 H
son for the child’s virilization. At that time, they
. C- V# I$ n. ~) z0 [: O- Jdecided to put the baby in a separate bed, and the" e; t( Z8 O; _; v; Q0 N: U' R% I
father was not hugging him with bare skin and had4 h5 J( t' {0 n: w- M& I
been using protective clothing. A repeat testosterone
4 U5 ~. K6 ?8 y' ptest was ordered, but the family did not go to the" i9 {; I% z3 H
laboratory to obtain the test.8 a5 @# W8 B' H/ M G
Discussion0 p: E! w/ v/ E% P* d/ }. c
Precocious puberty in boys is defined as secondary
}3 c# w# n( `& H" Q3 Csexual development before 9 years of age.1,4
: C+ P5 I6 q: E; K' @7 H+ h; n; NPrecocious puberty is termed as central (true) when
; v L% u# ?) s z+ ~it is caused by the premature activation of hypo-
+ q2 Q F; H; d6 `thalamic pituitary gonadal axis. CPP is more com-
- o! \, ]8 [- `! I- g+ T5 E4 H0 `. c3 _mon in girls than in boys.1,3 Most boys with CPP+ ]2 v+ N6 }, e6 P2 R( m! l0 H9 F
may have a central nervous system lesion that is# Z- ]2 I0 {+ K% s6 l
responsible for the early activation of the hypothal-. g" h! ?# \1 S' a" P
amic pituitary gonadal axis.1-3 Thus, greater empha-
1 i% a7 |+ y4 E; G$ Csis has been given to neuroradiologic imaging in
" c% s, _" \; g8 \boys with precocious puberty. In addition to viril-: a& D5 n } `; K. ~/ Y7 Z
ization, the clinical hallmark of CPP is the symmet-
& O1 x7 v/ w1 L7 krical testicular growth secondary to stimulation by: U# M5 p* ~/ l! M
gonadotropins.1,3
" ~* Z& f$ o1 q1 n, D3 I. nGonadotropin-independent peripheral preco-! G9 |1 W# C- O1 o# X3 Q! I1 F" O
cious puberty in boys also results from inappropriate
/ d# i: J8 `4 W9 U5 \1 L5 [androgenic stimulation from either endogenous or$ m$ A! h. Q* ]6 G0 k. ^6 _, l
exogenous sources, nonpituitary gonadotropin stim-
% }' A6 C! Y2 D" h8 nulation, and rare activating mutations.3 Virilizing
& A% R3 \: y9 _: o2 ?- @ |congenital adrenal hyperplasia producing excessive
- Y5 {3 ?6 h. q+ O2 x- Gadrenal androgens is a common cause of precocious
# {5 g5 W& U5 ^( \puberty in boys.3,4
. h L0 V+ ^ \8 [The most common form of congenital adrenal
8 r' o- B- |( X2 Nhyperplasia is the 21-hydroxylase enzyme deficiency.9 j% }7 [0 v6 N( c+ R
The 11-β hydroxylase deficiency may also result in4 u! a( U# t) e4 s1 n
excessive adrenal androgen production, and rarely,
! e q; D2 b" J# R6 y( j% l' ]an adrenal tumor may also cause adrenal androgen) P( u# V( z& x% a. m1 C( V
excess.1,3: n( t+ r% }8 B( c* c, U2 z4 h: n' n
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from- v% p; U0 K8 G; Y) N
542 Clinical Pediatrics / Vol. 46, No. 6, July 20073 s; f, Q; w$ ^ z8 s
A unique entity of male-limited gonadotropin-+ l! J: a; N9 I3 e6 K+ |
independent precocious puberty, which is also known
6 W' ^0 x# j, i Q2 v7 S2 l' vas testotoxicosis, may cause precocious puberty at a
0 h0 k; a! K" p7 Q6 N$ M) \- Zvery young age. The physical findings in these boys2 \ n0 M/ _ X9 @' ?
with this disorder are full pubertal development,
2 y8 Q" z; W) \$ `including bilateral testicular growth, similar to boys
( V, K* w8 o) v$ lwith CPP. The gonadotropin levels in this disorder
, c2 C T2 ~. t" T8 Eare suppressed to prepubertal levels and do not show
6 C: x- l& m& G% [5 ^pubertal response of gonadotropin after gonadotropin-; y( K+ `# r, Y
releasing hormone stimulation. This is a sex-linked/ z N) _- D/ c- d E* ~
autosomal dominant disorder that affects only5 {0 K9 H, U. {. q3 E
males; therefore, other male members of the family
6 J( `" X" q' T" T; ~7 mmay have similar precocious puberty.3& X+ h s+ v/ Q, T) r+ P
In our patient, physical examination was incon-
; K j6 C9 ^1 L a+ d$ ]sistent with true precocious puberty since his testi-
0 `) }5 O- p. }2 \7 u1 wcles were prepubertal in size. However, testotoxicosis
. w3 Y5 H" M; T8 Wwas in the differential diagnosis because his father- G/ s `, a! o. p9 Z+ x* e
started puberty somewhat early, and occasionally,; D$ j/ j& ~& p6 e
testicular enlargement is not that evident in the
* M0 U& B# L. R. e- g3 g4 S4 hbeginning of this process.1 In the absence of a neg-2 g5 G2 e5 b& i) ?/ `
ative initial history of androgen exposure, our. F6 i( C9 ~1 \ m* J
biggest concern was virilizing adrenal hyperplasia,+ Q. l7 B5 \& E; [2 C
either 21-hydroxylase deficiency or 11-β hydroxylase+ Z# F. O9 N6 X
deficiency. Those diagnoses were excluded by find-
9 t7 x0 y% t" Aing the normal level of adrenal steroids.
8 `* q. G9 `1 I6 I( r5 qThe diagnosis of exogenous androgens was strongly
0 L/ J2 K! t+ i- m1 Z! C" lsuspected in a follow-up visit after 4 months because
- w0 E. d1 _0 K+ Ethe physical examination revealed the complete disap-: V- ]' t5 q) K; i& `6 u
pearance of pubic hair, normal growth velocity, and0 ?6 P. P. S. c+ ~
decreased erections. The father admitted using a testos-" [/ |% O7 A% i' G; A: g: A5 ^
terone gel, which he concealed at first visit. He was! v, {; E; V" f+ A, O
using it rather frequently, twice a day. The Physicians’% m" G9 ]# d! R2 |1 L/ e9 ~! X1 ?
Desk Reference, or package insert of this product, gel or1 P e) s- O1 |- D
cream, cautions about dermal testosterone transfer to {5 I- a& R' R* R' [& l. _' A1 `, z
unprotected females through direct skin exposure.! p( ~2 }9 j* q4 F. G1 C
Serum testosterone level was found to be 2 times the6 M' b" \' g0 k0 g: z% Z4 a
baseline value in those females who were exposed to
5 I' p7 e4 b: i6 keven 15 minutes of direct skin contact with their male$ w; C; a# }; x) Y- M% d- X
partners.6 However, when a shirt covered the applica-
) b2 r9 H% r3 i" j, J3 Rtion site, this testosterone transfer was prevented.% T, Y. y. k7 E9 [
Our patient’s testosterone level was 60 ng/mL,
1 C! s( y( p: y3 l( Cwhich was clearly high. Some studies suggest that$ Z# q) i7 I) H3 W) k
dermal conversion of testosterone to dihydrotestos-$ o' T' p9 U" l6 O; K6 G( ~; s/ G
terone, which is a more potent metabolite, is more" w# X) r# d6 b6 E+ ~
active in young children exposed to testosterone
- t* m9 x$ g( [5 Iexogenously7; however, we did not measure a dihy-
" m4 e, U$ T; F2 E: @8 ydrotestosterone level in our patient. In addition to- s) z0 F* j; d
virilization, exposure to exogenous testosterone in
4 U# E+ H8 M: p/ L; C- cchildren results in an increase in growth velocity and
* G: K- s# N; V0 n7 madvanced bone age, as seen in our patient.
) O# ]. D: ?/ m; fThe long-term effect of androgen exposure during0 C8 i1 q9 n \5 A+ `! E/ a5 K
early childhood on pubertal development and final
* l5 n$ ^1 `: i, u' F1 Hadult height are not fully known and always remain
|& T1 f1 B- y$ A @6 B+ b xa concern. Children treated with short-term testos-
3 V. o, @( K2 g; aterone injection or topical androgen may exhibit some
; c* u# i l! d$ e' D- eacceleration of the skeletal maturation; however, after' c2 }' _" F; a* u7 i! f
cessation of treatment, the rate of bone maturation3 Z- A5 A; O, U/ G: C2 h8 c' g
decelerates and gradually returns to normal.8,94 ?) l0 d' W+ ?; Y; `9 P. d9 |, ?* X
There are conflicting reports and controversy$ K9 ]* j; a6 M
over the effect of early androgen exposure on adult7 z2 y$ f9 `3 H9 \/ V2 t
penile length.10,11 Some reports suggest subnormal
) B5 z9 S- y' f9 |0 gadult penile length, apparently because of downreg-# s+ w h/ H: h4 Z0 H% W* \
ulation of androgen receptor number.10,12 However,
5 ]5 W7 _: p4 h& nSutherland et al13 did not find a correlation between
$ j+ s" [8 t. H3 p2 O1 jchildhood testosterone exposure and reduced adult
' f0 A0 |# {$ Q2 e$ Ppenile length in clinical studies.
8 A/ q* I3 z. A) z, }0 `5 YNonetheless, we do not believe our patient is/ T3 |" p) N4 D' P
going to experience any of the untoward effects from, R5 D% u! {- P, u/ A
testosterone exposure as mentioned earlier because" ?: P4 ]) {# P4 U- X4 m; z& t
the exposure was not for a prolonged period of time. H |$ M$ w- H* U! y0 P& p
Although the bone age was advanced at the time of7 j4 C. q( v1 |# [$ c: I
diagnosis, the child had a normal growth velocity at, k" t7 w4 E& u9 ]. o6 j" g
the follow-up visit. It is hoped that his final adult- ?' ~3 K/ d, }8 }- X
height will not be affected.) @6 _: z6 a; M# k, Y! v
Although rarely reported, the widespread avail-
" [* [4 ^- C0 f3 ]6 p/ f8 W0 Qability of androgen products in our society may. T% C0 P4 G) K4 P+ z. h
indeed cause more virilization in male or female. P( U& F- ^8 m1 s& P7 ?
children than one would realize. Exposure to andro-4 u$ V2 _2 w" o" T4 j# c" M
gen products must be considered and specific ques- }0 Z& H3 f, U/ z, v
tioning about the use of a testosterone product or1 W; x5 J+ U! q" u
gel should be asked of the family members during( x" K0 \' ^6 T$ q% a- g }: [
the evaluation of any children who present with vir-1 N: S Z) j) {) ?8 p/ S
ilization or peripheral precocious puberty. The diag-
. k w2 Z7 `& X0 F! H3 Dnosis can be established by just a few tests and by
. F( U5 X+ E7 s' gappropriate history. The inability to obtain such a
]" e& n1 E1 o' t( ~history, or failure to ask the specific questions, may
) N. A+ p0 M- ^7 Presult in extensive, unnecessary, and expensive
& C' J B. V+ p3 Q3 X# R6 t7 minvestigation. The primary care physician should be
0 Z. h% m: j* ?# Z+ f% aaware of this fact, because most of these children5 @* s8 Z; s' J( x* }/ H6 V
may initially present in their practice. The Physicians’
- s/ X9 v3 _# \2 MDesk Reference and package insert should also put a
/ T6 H3 ]8 c. e! _ g- ~warning about the virilizing effect on a male or: n7 M# s& x) e
female child who might come in contact with some-, A2 N0 Q# G0 M8 g
one using any of these products.' K( [# U2 M: ?6 x2 N+ V9 i* K! A$ L
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2002: 565-628./ }' H; d5 o& B
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
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( h/ |8 Q. [9 Z4 ?development in a two-year-old boy induced by topical
, T* r: H& D5 @: m. x/ }0 ~/ t5 Kexposure to testosterone. Pediatrics. 1999;104:e23.
- C1 x! |! w. C( J5. Greulich WW, Pyle SI, eds. Radiographic Atlas of7 `# x: g1 t/ h
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Stanford, CA: Stanford University Press; 1959.4 T6 Y3 u( ^5 Y. `7 ?
6. Physicians’ Desk Reference. Androgel 1% testosterone,3 b$ M+ }1 \* W
Unimed Pharmaceutical Inc. Montvale, NJ: Medical
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