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is a significant concern for physicians. Central
' @! z4 t5 J9 e! V& Iprecocious puberty (CPP), which is mediated
3 l# m% W' _$ k' B3 h) P& Gthrough the hypothalamic pituitary gonadal axis, has9 a& v3 T8 ~6 X
a higher incidence of organic central nervous system. g" W7 I1 A( k! @8 m6 E+ |8 f
lesions in boys.1,2 Virilization in boys, as manifested# L7 |& _* m+ ]' G+ }9 @' o
by enlargement of the penis, development of pubic
! q1 [; r! x W/ lhair, and facial acne without enlargement of testi-
+ K/ N& E) U3 S [3 j9 w, ecles, suggests peripheral or pseudopuberty.1-3 We( O+ k- V0 \( g# [) n6 R: m7 D
report a 16-month-old boy who presented with the
9 N0 F6 l7 p2 F3 Wenlargement of the phallus and pubic hair develop-2 Y, b3 A9 ~4 b) S, Z
ment without testicular enlargement, which was due
$ O3 }$ r5 b0 ]9 v: }to the unintentional exposure to androgen gel used by
* s" y9 C" c4 F1 J0 s- {5 Ethe father. The family initially concealed this infor-
! Z' F& |$ {( O$ vmation, resulting in an extensive work-up for this
! ^; A; s# q7 `" G4 \child. Given the widespread and easy availability of( M8 K" N6 W) a) f. D# K
testosterone gel and cream, we believe this is proba-* I- G* S7 m" Q; g
bly more common than the rare case report in the. A0 { I& ?. ]7 |: t7 v- G
literature.4
, z! G" B- Y3 B* C- tPatient Report- T# N/ S4 L+ z/ U, _0 L- @
A 16-month-old white child was referred to the
; \ ?0 _* D) p3 Lendocrine clinic by his pediatrician with the concern1 n8 G% G- D4 |$ E3 J+ _2 v
of early sexual development. His mother noticed
- ^' D, u) o0 h M- E. N+ L+ plight colored pubic hair development when he was
. j& C ^) |$ N! W, `4 vFrom the 1Division of Pediatric Endocrinology, 2University of
: Q- W1 G* o6 j( a: tSouth Alabama Medical Center, Mobile, Alabama.; t+ r; {' ~; \2 V& K
Address correspondence to: Samar K. Bhowmick, MD, FACE,
4 A8 w; s. R7 y( zProfessor of Pediatrics, University of South Alabama, College of
/ g1 a3 h0 p: q# ^) o3 g" x5 q2 T3 qMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;* n: C. o1 u A. D7 a
e-mail: [email protected].
# d0 T' n8 ^4 i! y Nabout 6 to 7 months old, which progressively became5 x+ u8 t" p/ F7 k
darker. She was also concerned about the enlarge-9 T2 k3 n/ Z5 o5 F: I9 D1 @
ment of his penis and frequent erections. The child
& j% D" K* `8 W, F- m& @) owas the product of a full-term normal delivery, with
$ w; l; e' q0 L$ e5 _& v2 M9 ?! aa birth weight of 7 lb 14 oz, and birth length of
& ^ e9 K( J5 W+ Y( M: ^ P! i20 inches. He was breast-fed throughout the first year
; k3 t% a8 [3 cof life and was still receiving breast milk along with
# A7 N8 T/ @6 V. F% e6 R v# t$ x2 `: ^solid food. He had no hospitalizations or surgery,
! _2 ~/ f3 ]4 v' q0 U! hand his psychosocial and psychomotor development. y9 ~& O; E0 e D6 K
was age appropriate." |& b9 L; R! V2 s7 B8 f& e' a
The family history was remarkable for the father," t) g4 I1 k: i, D+ `7 H6 `: H
who was diagnosed with hypothyroidism at age 16,
% n5 {9 b* l( M' x* u0 u* s& }which was treated with thyroxine. The father’s
) H! \+ |. D( ^( t. m7 wheight was 6 feet, and he went through a somewhat5 o/ z8 Z+ a; |& x2 I7 Z
early puberty and had stopped growing by age 14.
, r f# [ D; mThe father denied taking any other medication. The q9 T. `8 |4 w [7 H4 Z
child’s mother was in good health. Her menarche
- L/ ]; A& m( M; m. L& Awas at 11 years of age, and her height was at 5 feet
5 k& Y% p& U$ s; d! m5 inches. There was no other family history of pre-
$ `) f) g9 \6 J) s# T. Q9 q0 ccocious sexual development in the first-degree rela-. e |9 G4 b& _* ]
tives. There were no siblings.: N* ^+ g8 A$ N) K0 b) S
Physical Examination7 e- I0 N1 J+ o+ j: _& S2 m) E6 o; ~
The physical examination revealed a very active,; }; i$ `& k" c( a
playful, and healthy boy. The vital signs documented) a4 n2 T. a9 p5 m/ F% T: i
a blood pressure of 85/50 mm Hg, his length was
$ N) ?! g8 |) S90 cm (>97th percentile), and his weight was 14.4 kg5 |5 a2 l; K! d) x
(also >97th percentile). The observed yearly growth
9 c) w: B9 F9 d9 r2 q2 z+ avelocity was 30 cm (12 inches). The examination of" W/ B8 n, O/ i5 v6 Z: L
the neck revealed no thyroid enlargement.' v+ n+ G5 f# v/ T* T# _" i* t
The genitourinary examination was remarkable for
. j" |" G" p# ^5 C$ lenlargement of the penis, with a stretched length of
( v4 ~1 G# j: b* v8 cm and a width of 2 cm. The glans penis was very well
7 K+ @* k7 R2 n2 a% P$ c* r- zdeveloped. The pubic hair was Tanner II, mostly around
3 Y2 A2 E" \' a2 T: ^9 ]540 Z. m6 X) O7 M% E
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from# j3 y g" f0 i
the base of the phallus and was dark and curled. The: s0 ]7 \( r1 L# U. J$ v+ k/ l
testicular volume was prepubertal at 2 mL each.
3 S0 |, a7 @* O) ]The skin was moist and smooth and somewhat( M3 \ Z" l3 g4 k
oily. No axillary hair was noted. There were no
: K2 k! X8 E+ Q3 k( X% w' w6 Kabnormal skin pigmentations or café-au-lait spots.5 W' f. T# T- C4 V5 j& b( l
Neurologic evaluation showed deep tendon reflex 2+ T- w4 x: ?2 r! _. t0 M+ E
bilateral and symmetrical. There was no suggestion
6 Q1 v" o$ z! e8 k/ eof papilledema.
) _: r! g/ Z+ z6 fLaboratory Evaluation0 o5 s, t, d( A3 P! _& M
The bone age was consistent with 28 months by! W9 B. g @* p. Q/ E$ {
using the standard of Greulich and Pyle at a chrono-
0 f1 _7 }4 \ M clogic age of 16 months (advanced).5 Chromosomal+ [, v. x. F% n# ^6 s6 v
karyotype was 46XY. The thyroid function test* a3 R! N( w) P+ E D
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
/ _4 b" V" L( S5 l0 j4 d$ vlating hormone level was 1.3 µIU/mL (both normal).
5 a/ d: [8 Y: Y% H* M& tThe concentrations of serum electrolytes, blood9 G: @# r% u: h- t
urea nitrogen, creatinine, and calcium all were9 S6 x$ \& G' ]# A, n$ @- s( k/ a
within normal range for his age. The concentration
5 Z3 Z7 O3 t8 fof serum 17-hydroxyprogesterone was 16 ng/dL" l7 i8 Y3 k9 g% l
(normal, 3 to 90 ng/dL), androstenedione was 20
& \) c' D% K! |/ `) wng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-9 k8 r( l! F/ z, h
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
! ^8 [ [5 V$ d6 adesoxycorticosterone was 4.3 ng/dL (normal, 7 to, e6 V! l' F1 U9 S+ q
49ng/dL), 11-desoxycortisol (specific compound S)8 D D+ g1 l% Z7 C7 g) Y
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
' C: m( `" b4 [/ e& Ytisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total$ m# d+ A3 o* ~9 Q1 g$ E
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
' `0 R+ U: g c( ~7 m6 h# p2 ^and β-human chorionic gonadotropin was less than1 K8 T+ \; g8 l5 S
5 mIU/mL (normal <5 mIU/mL). Serum follicular
* d. m$ z T7 u9 x- ?" zstimulating hormone and leuteinizing hormone, ]( \/ ~- H; m- h/ I3 N# `
concentrations were less than 0.05 mIU/mL% `0 w" c {3 q' j% Z
(prepubertal).
' t2 w% { d- C- y$ JThe parents were notified about the laboratory. m w) s, x, e9 I+ h: L E; Y
results and were informed that all of the tests were
i- Q$ Y& L$ Q3 onormal except the testosterone level was high. The
, T4 ]+ U0 V, J2 Mfollow-up visit was arranged within a few weeks to y* J7 k L$ \) t# q
obtain testicular and abdominal sonograms; how-
8 K+ B, W8 p) j+ d S* c3 [% m# uever, the family did not return for 4 months., C2 \4 f# s- ^& W0 Q' K3 O+ i
Physical examination at this time revealed that the% z4 u" k) Q/ V7 _% E% p L- C
child had grown 2.5 cm in 4 months and had gained
- T. B, W: L1 O2 Y: M2 kg of weight. Physical examination remained! k3 N) `; N4 C0 [% @% m% K
unchanged. Surprisingly, the pubic hair almost com-
5 V3 O" i0 S2 f! o9 J0 Ppletely disappeared except for a few vellous hairs at, J! k6 q) N2 S! [
the base of the phallus. Testicular volume was still 2) A6 f+ _9 [' h' V& k
mL, and the size of the penis remained unchanged.
# T1 ]# ]0 u qThe mother also said that the boy was no longer hav-
6 ~/ M% ^/ u' k f Ping frequent erections.* G+ @* C- V$ M" g, z
Both parents were again questioned about use of9 W; H1 n0 ?" u7 b% ?3 c1 Q
any ointment/creams that they may have applied to
( h0 @. L" t4 u* X1 ^7 Zthe child’s skin. This time the father admitted the% P3 D: F5 U! v9 Y. M
Topical Testosterone Exposure / Bhowmick et al 541' X2 R' O. N# S: x( B4 t- ^
use of testosterone gel twice daily that he was apply-9 T: n8 E g6 u! n, c
ing over his own shoulders, chest, and back area for5 _+ j7 U6 U: Q3 b* l- _0 t
a year. The father also revealed he was embarrassed3 E2 a: {2 F6 D4 ~8 l( _
to disclose that he was using a testosterone gel pre-1 e" [, K- B) B) V# r6 U# e6 B! o( O
scribed by his family physician for decreased libido( @ L) V) ^3 M& ]
secondary to depression.
. R: w2 y2 ]5 Q/ t# pThe child slept in the same bed with parents., t7 K! p! q8 V9 k- b% Q) p
The father would hug the baby and hold him on his
& o2 z- b: ~/ E# A- b1 @chest for a considerable period of time, causing sig-
5 {; ]: O' S' |7 I5 K( rnificant bare skin contact between baby and father.5 `4 D8 O* U6 `) B$ f; O/ o% E( W
The father also admitted that after the phone call,
; Q. N# E' V5 r* @# M% Owhen he learned the testosterone level in the baby
S! u3 O8 W5 Uwas high, he then read the product information3 G- ~; F. F Q, T* j- |5 f
packet and concluded that it was most likely the rea-% o1 U0 Z( \8 I# {8 O2 O
son for the child’s virilization. At that time, they5 F9 Q% k! }, z- N% q
decided to put the baby in a separate bed, and the
( \; `4 f2 h2 ~father was not hugging him with bare skin and had
& e) K1 @3 W5 t; n$ t2 q9 Q" T8 Sbeen using protective clothing. A repeat testosterone! n" O+ Q* J- h. r- q( e t
test was ordered, but the family did not go to the
# S% t: `8 r; Wlaboratory to obtain the test.8 N& {5 @- f3 r5 M1 f: w' z
Discussion
0 E5 M% l& c# c# f/ _ [2 UPrecocious puberty in boys is defined as secondary: F' t2 L) ^4 W; u2 [! d
sexual development before 9 years of age.1,42 r% }- @* k, k% z5 r7 c' a
Precocious puberty is termed as central (true) when4 ?# k: o3 Z' T" P7 H! M
it is caused by the premature activation of hypo-
5 R3 ?9 d4 C1 qthalamic pituitary gonadal axis. CPP is more com-: y; o& z( _2 u4 N; p* {
mon in girls than in boys.1,3 Most boys with CPP
8 x w1 q7 i; N7 C' vmay have a central nervous system lesion that is5 ~9 i. D, V, B) D0 b
responsible for the early activation of the hypothal-
" R1 ]* y& @3 j8 e+ `1 z. Zamic pituitary gonadal axis.1-3 Thus, greater empha-( T2 ]' K9 N3 I
sis has been given to neuroradiologic imaging in
# f, e' \" |4 I* nboys with precocious puberty. In addition to viril-/ l! v, t1 {/ L+ x# j
ization, the clinical hallmark of CPP is the symmet-
5 ]' d: e$ L1 w& [3 v: T+ urical testicular growth secondary to stimulation by
" M6 s& |- ]3 T8 J" S1 |gonadotropins.1,3* T* @& I( {8 C3 Q
Gonadotropin-independent peripheral preco-! |7 z& D% Q# a$ h0 f
cious puberty in boys also results from inappropriate( Q& i. @( I O/ N U
androgenic stimulation from either endogenous or
6 C! d; x% [; ^( u. q2 I2 vexogenous sources, nonpituitary gonadotropin stim-0 B5 a% K) ]; h/ @ s
ulation, and rare activating mutations.3 Virilizing9 Y) l$ ?* ^+ Z
congenital adrenal hyperplasia producing excessive1 S! K$ v$ O8 s" X+ x: W
adrenal androgens is a common cause of precocious
# Q. S; T" t- k9 A" m5 w5 b/ zpuberty in boys.3,4# W9 S% P' J4 ?. j
The most common form of congenital adrenal& ]/ y4 A+ Z( I9 Y, q2 G: \
hyperplasia is the 21-hydroxylase enzyme deficiency.# j, }& d' [: G. Z
The 11-β hydroxylase deficiency may also result in
1 ` F- q4 U6 Z) K& W! N. Mexcessive adrenal androgen production, and rarely,
- d1 U! A D }" n) _2 K) m" k, y& B6 ean adrenal tumor may also cause adrenal androgen
7 P& ~1 ?" l( [. X2 Z1 H2 Lexcess.1,3/ z" y" w. r! \" T: c
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from, t# s5 c: \4 K* R
542 Clinical Pediatrics / Vol. 46, No. 6, July 20070 b/ D- [, Q7 g7 C; K) O6 T+ l) G
A unique entity of male-limited gonadotropin-
' G! Z1 n, [+ f. Rindependent precocious puberty, which is also known
- S7 W8 `- _/ l1 Sas testotoxicosis, may cause precocious puberty at a# t/ G$ x1 a [) \1 T* J
very young age. The physical findings in these boys4 M$ `) v+ n# E6 `
with this disorder are full pubertal development,0 C6 k! x* P7 L( d& c
including bilateral testicular growth, similar to boys6 {( \. [7 L' p0 o
with CPP. The gonadotropin levels in this disorder
! F1 F/ \: M4 Z) |are suppressed to prepubertal levels and do not show# x4 t% Z8 |' W( d# [* N& f
pubertal response of gonadotropin after gonadotropin-
% n+ o+ H. \( e* _1 |0 c c: {releasing hormone stimulation. This is a sex-linked8 `# h2 S4 S3 k9 M2 I
autosomal dominant disorder that affects only* G3 Q5 C: u6 s& F
males; therefore, other male members of the family
' @" a6 r- P$ j* Y4 }may have similar precocious puberty.3( g. G: u6 X0 a
In our patient, physical examination was incon- r$ _9 W, P/ v
sistent with true precocious puberty since his testi-8 Y; R k9 {3 F8 a( G$ g6 |
cles were prepubertal in size. However, testotoxicosis
7 I* d: x. F% X" k: W* _was in the differential diagnosis because his father5 J* m. v2 m. c/ V, Z$ ^7 C$ S% B
started puberty somewhat early, and occasionally,4 }0 j( l8 p0 t2 ], n3 R' e0 p' g
testicular enlargement is not that evident in the
- o" E2 B% ?0 Qbeginning of this process.1 In the absence of a neg-$ `3 Q3 l: z' M! ^( t/ Q; }& ]. o
ative initial history of androgen exposure, our
0 U! Z$ k/ N4 i- l" Gbiggest concern was virilizing adrenal hyperplasia,2 h5 o" i% U8 U* ^0 I8 Q. f7 V
either 21-hydroxylase deficiency or 11-β hydroxylase
/ L; T. s, Y4 r, y* s/ n! gdeficiency. Those diagnoses were excluded by find-
; X3 k$ B9 v" l9 [+ d ^- Oing the normal level of adrenal steroids.
! R( a% T1 R) {5 EThe diagnosis of exogenous androgens was strongly4 |- d! h7 _6 T+ v' S8 Z! {
suspected in a follow-up visit after 4 months because
* v' N- t& q2 n9 m; A/ c: k+ Tthe physical examination revealed the complete disap-% K+ u7 ^ O* u; k+ A* L& p/ [
pearance of pubic hair, normal growth velocity, and
5 j2 e1 E3 J+ l2 G! }1 n, a( Hdecreased erections. The father admitted using a testos-9 R" h9 F+ d$ z5 q, _* e
terone gel, which he concealed at first visit. He was
0 n) }) ~1 N* r+ T9 Qusing it rather frequently, twice a day. The Physicians’
1 r6 [: g7 @8 g, rDesk Reference, or package insert of this product, gel or4 v# A; w& R- t9 P
cream, cautions about dermal testosterone transfer to
7 d/ U& Y& P$ a3 _unprotected females through direct skin exposure.9 @* H' M3 P+ W- i+ c+ L) n( J
Serum testosterone level was found to be 2 times the# J6 p8 m( o, {; \" N
baseline value in those females who were exposed to6 ?( m& F- _7 H7 Z6 o( {
even 15 minutes of direct skin contact with their male' S* j B. e5 w x
partners.6 However, when a shirt covered the applica-
8 i' G9 j! }1 n6 {7 c. l5 Z; {/ O3 E% otion site, this testosterone transfer was prevented.
# j% _& X q& q( l% K) cOur patient’s testosterone level was 60 ng/mL,
+ i' }" @4 f. Y9 K6 m3 f9 n7 P+ Fwhich was clearly high. Some studies suggest that
" q+ P! _, G8 `6 x% \dermal conversion of testosterone to dihydrotestos-
) A* D# P& H: T; e1 Z6 {; Bterone, which is a more potent metabolite, is more
: r/ O" {7 S) D/ B' D2 Aactive in young children exposed to testosterone
7 m. u- A4 P, I( U: @exogenously7; however, we did not measure a dihy-
* w" x6 z* ]. m; ydrotestosterone level in our patient. In addition to
* H6 W: c" Z6 R" rvirilization, exposure to exogenous testosterone in
1 z, _1 @6 F! B; S- D3 R( Ychildren results in an increase in growth velocity and& V6 x" \# C& D3 w8 ~& V
advanced bone age, as seen in our patient.% p5 [7 ~. d- e$ H
The long-term effect of androgen exposure during8 j* _! L2 l4 S
early childhood on pubertal development and final
" k' c0 \$ `+ T$ h+ Sadult height are not fully known and always remain
% B# K+ l* W+ S6 na concern. Children treated with short-term testos-3 Y( J+ u+ y, y* R/ `: k" V
terone injection or topical androgen may exhibit some
2 V2 [6 g# d2 K* aacceleration of the skeletal maturation; however, after
5 c! v4 T6 Y5 Icessation of treatment, the rate of bone maturation
/ n9 V2 m" L) G# s! [0 cdecelerates and gradually returns to normal.8,9
; e" }0 M8 k. V0 j# X, nThere are conflicting reports and controversy G4 h& @2 `8 Q
over the effect of early androgen exposure on adult4 t! W: g0 i* J, ^) I/ G- Q
penile length.10,11 Some reports suggest subnormal
2 z0 k) Y4 S0 Z# T" Radult penile length, apparently because of downreg-
$ r& q. F8 o* Q! {; Y# R, U, X: b# v: Yulation of androgen receptor number.10,12 However,! f4 K* B5 u3 b' P
Sutherland et al13 did not find a correlation between1 Y7 ^5 @7 E9 ^; b2 ~
childhood testosterone exposure and reduced adult
3 |2 u: ~4 @5 H9 S$ a0 U+ Qpenile length in clinical studies.
+ [7 {* z* j0 B, e# I0 ?- TNonetheless, we do not believe our patient is0 C% n) [" R5 V1 l a
going to experience any of the untoward effects from
4 R. W0 o: I9 n8 p& ]: X+ f: Ntestosterone exposure as mentioned earlier because
5 D+ M0 `' H0 u& T: J% nthe exposure was not for a prolonged period of time.
- x A9 c' V4 I. b) [3 R5 K% V7 oAlthough the bone age was advanced at the time of6 K* y( j$ y, W" }6 a1 E2 P; p
diagnosis, the child had a normal growth velocity at" ^* V7 n5 r7 Y2 q- X; d8 |
the follow-up visit. It is hoped that his final adult3 `) c V5 R/ g
height will not be affected.
/ o$ q& S+ L9 m" C: ~Although rarely reported, the widespread avail-
- T! y7 U, I. Q3 q: Y( Y2 qability of androgen products in our society may
: D5 T9 l4 ^" p" o% Z0 F# @+ g/ }indeed cause more virilization in male or female$ m- H7 O/ m% h! Z D
children than one would realize. Exposure to andro-" n$ S7 z/ o) o( J/ y2 P! _) q
gen products must be considered and specific ques-
+ n! u; Q- L6 i7 ^7 |6 Ktioning about the use of a testosterone product or
2 ]6 ^7 v, A8 a: U2 Jgel should be asked of the family members during
( K4 w ?" f6 n3 mthe evaluation of any children who present with vir-
5 Z; Z0 F: M& R A. w7 v2 {ilization or peripheral precocious puberty. The diag-0 w! P2 |( f! a' e- {: @' C; t
nosis can be established by just a few tests and by. x/ ~9 d: d* N0 D6 B
appropriate history. The inability to obtain such a
. w9 ~! x% C& l# j+ q7 u; m) ehistory, or failure to ask the specific questions, may
+ @4 R4 X7 T' d0 E$ s' E. gresult in extensive, unnecessary, and expensive
! ^4 a4 @( `5 m2 u3 a) t7 ~2 i5 Uinvestigation. The primary care physician should be, n- H S( e5 K
aware of this fact, because most of these children
& n4 M4 }3 v6 F5 ]2 `6 A! _: Jmay initially present in their practice. The Physicians’+ a* @6 ^. P/ [8 z N' q
Desk Reference and package insert should also put a- r. H6 K9 w) a. _4 M$ F1 c
warning about the virilizing effect on a male or, h. I$ L M- u; D; k0 K4 B) I
female child who might come in contact with some-
! l7 ?5 r4 E. a6 x! oone using any of these products.0 \# c, S3 P+ `& F1 P0 \8 e( o
References
% G& V9 ]; h8 @$ s0 [- I' r$ a9 q6 J! v1. Styne DM. The testes: disorder of sexual differentiation" Z6 n7 W) r' t" V2 G
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, R8 N% e3 Y8 ]9 c& g. ?2 F% Npuberty in children with tumours of the suprasellar pineal
# P2 k0 t) @/ Y5 B0 ~" Oat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from- j! ~; O" f7 \; ]
Topical Testosterone Exposure / Bhowmick et al 543* r/ T( n7 b& w6 M6 I' ~3 u! R
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; x+ y/ N. |# x" Z7 B1 m* d7 fexposure to testosterone. Pediatrics. 1999;104:e23.4 t+ V9 u: f* Z% S; X! b5 j3 G
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Stanford, CA: Stanford University Press; 1959.8 w* j( y: ]& [7 v
6. Physicians’ Desk Reference. Androgel 1% testosterone,
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Economics Company, Inc; 2004:3239-3241.
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