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is a significant concern for physicians. Central
. z% H1 J% j; b- H% m0 k6 N2 Wprecocious puberty (CPP), which is mediated( ?8 \' N" D3 G R: ~2 K
through the hypothalamic pituitary gonadal axis, has6 \" X( G3 U5 [: f6 @( f% P7 q/ ^
a higher incidence of organic central nervous system5 F, Q4 N) K. O! F
lesions in boys.1,2 Virilization in boys, as manifested
# R- ~! a' W0 T' U2 U- j- x" K( gby enlargement of the penis, development of pubic, j; P# Y" X% v4 k
hair, and facial acne without enlargement of testi-
c# `. M0 X( A' gcles, suggests peripheral or pseudopuberty.1-3 We
0 v) @9 B$ ^" t7 x$ mreport a 16-month-old boy who presented with the# G8 T5 A/ x( } ~1 W" J" [6 Z) ?
enlargement of the phallus and pubic hair develop-! {5 p! s# ~- c, m. @8 v5 P
ment without testicular enlargement, which was due
& b' D6 t! H/ M% h- I) qto the unintentional exposure to androgen gel used by ^4 s& G1 ^0 i: v0 D; N
the father. The family initially concealed this infor-6 x6 [+ P6 r2 F. }3 S
mation, resulting in an extensive work-up for this! a+ e8 V) o4 S; r+ N
child. Given the widespread and easy availability of
5 C- w+ ^4 S' J1 v" |) Utestosterone gel and cream, we believe this is proba-
; V$ J2 m& }3 }bly more common than the rare case report in the
5 |, q- i* G" tliterature.4
" p \8 [8 A; b( F* }Patient Report( r/ {/ Z1 n" H: l" z( |
A 16-month-old white child was referred to the5 s1 P& ?" D. A; O+ u
endocrine clinic by his pediatrician with the concern. I! i% z) D1 z# e
of early sexual development. His mother noticed
" t0 L. A+ Y6 Y: }3 S* flight colored pubic hair development when he was
0 t1 {) I% A) ~From the 1Division of Pediatric Endocrinology, 2University of
0 V0 p* k8 j! X8 z6 r0 V JSouth Alabama Medical Center, Mobile, Alabama.- x- U; Z$ R0 c
Address correspondence to: Samar K. Bhowmick, MD, FACE,+ ?: v! y$ u# i L: ?' q8 F, B& ^
Professor of Pediatrics, University of South Alabama, College of& d* q$ v. }4 B9 |
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
9 F6 {8 }" J2 m9 ke-mail: [email protected].
% b3 U! r# B4 E1 m4 a5 Y4 Labout 6 to 7 months old, which progressively became
: U9 X1 L. [) a6 kdarker. She was also concerned about the enlarge-
# ~# w/ e4 k* b! rment of his penis and frequent erections. The child6 }1 |- f1 l+ h+ {: x, @
was the product of a full-term normal delivery, with
5 c1 f. P9 ~. G1 [8 [* x1 `) Y: Qa birth weight of 7 lb 14 oz, and birth length of1 U5 o" w# t0 E' ?$ m% T
20 inches. He was breast-fed throughout the first year
2 o/ n4 z P, G+ lof life and was still receiving breast milk along with. k- W6 ~1 _- Q% s% d
solid food. He had no hospitalizations or surgery,& [5 `: }! M0 _) s1 y8 b, ^9 V; T
and his psychosocial and psychomotor development
2 D( `% L. y6 N' C- f2 e% wwas age appropriate.
4 D( c/ J4 B8 S, |0 r- J8 CThe family history was remarkable for the father,: Z6 U- H# E) f9 a! O2 x) P/ g# N; N
who was diagnosed with hypothyroidism at age 16,
1 _0 N: o7 Z: L! e, H/ r3 iwhich was treated with thyroxine. The father’s6 k z, m( H' R7 h ]# P
height was 6 feet, and he went through a somewhat* X: w1 t' ?5 G! I
early puberty and had stopped growing by age 14.
w# g! h8 I3 i+ _3 PThe father denied taking any other medication. The* O. w/ x! [! v8 g7 c+ Q5 r2 F! S
child’s mother was in good health. Her menarche' ^9 L# ?2 N% [+ l* D
was at 11 years of age, and her height was at 5 feet, r! g% I( }# x. |! {. z& @
5 inches. There was no other family history of pre-8 Q: C8 D. `7 D. _& q
cocious sexual development in the first-degree rela-) P, a, J: v% a/ b; r+ ~
tives. There were no siblings.
2 a' d) }: n& {$ h9 G: `Physical Examination& H$ [8 s5 F* i/ g/ v
The physical examination revealed a very active,3 }0 p) M9 R; C/ w" y R4 k! S
playful, and healthy boy. The vital signs documented
4 N% O6 ]! B% fa blood pressure of 85/50 mm Hg, his length was2 j# I: Z5 S- E
90 cm (>97th percentile), and his weight was 14.4 kg/ |5 f. Z* T" }) y
(also >97th percentile). The observed yearly growth
% E- p$ K0 P5 v/ { Nvelocity was 30 cm (12 inches). The examination of4 r( Y7 I8 d X% ~& G4 V
the neck revealed no thyroid enlargement.
. n& c( ]2 R2 qThe genitourinary examination was remarkable for `9 t6 q% n( b: | v O* A6 e; _
enlargement of the penis, with a stretched length of
! }) F: g; B, u2 P6 G8 cm and a width of 2 cm. The glans penis was very well
7 r4 F- q0 }1 |" P7 h V/ ddeveloped. The pubic hair was Tanner II, mostly around
0 l6 R7 g2 L6 S1 S* s7 g5406 u0 j6 p" D* c R8 i# l( y2 g3 Z" X
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from9 d4 X& t# ^) w
the base of the phallus and was dark and curled. The1 i( y. P" N/ ]1 t( L% i" T! ]4 h& j
testicular volume was prepubertal at 2 mL each.
- V. s/ X9 A; b$ cThe skin was moist and smooth and somewhat- x3 z4 O; i+ a% _
oily. No axillary hair was noted. There were no) v" i8 \! M" K* f3 A
abnormal skin pigmentations or café-au-lait spots.
0 k6 \- ?' ]4 q* V! d" UNeurologic evaluation showed deep tendon reflex 2+
( l3 I3 O: e+ o& s! a/ e( Ubilateral and symmetrical. There was no suggestion
2 h4 c( {* ?/ A4 ^, n( Lof papilledema.
8 P& r l9 C* `$ Y9 [* x, p, X% ]% kLaboratory Evaluation
' @& {- V; Y7 c& j9 Z9 \The bone age was consistent with 28 months by' }7 J+ A* E- u5 I: k
using the standard of Greulich and Pyle at a chrono-
; O* B) c/ P2 F( \% W0 @" wlogic age of 16 months (advanced).5 Chromosomal
8 l. T( K0 Y1 M7 B3 { ikaryotype was 46XY. The thyroid function test' l3 x+ U* V! N/ O
showed a free T4 of 1.69 ng/dL, and thyroid stimu-, @/ E0 K, @1 y; b; }
lating hormone level was 1.3 µIU/mL (both normal).8 k3 E4 o/ c$ P1 w
The concentrations of serum electrolytes, blood
0 D. }) X9 w; p& @# H4 ^( jurea nitrogen, creatinine, and calcium all were
* X9 O+ ?. N1 ?9 t, q; l7 j3 P4 B4 Fwithin normal range for his age. The concentration
. d7 H" } ~7 g9 q( c% Cof serum 17-hydroxyprogesterone was 16 ng/dL
. M) ^# p% M6 V8 |1 b(normal, 3 to 90 ng/dL), androstenedione was 20
7 N2 V: V+ h$ _* @ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-6 {+ ?) x+ g7 ^+ b" A1 \
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
) w4 {" w" Y4 ]+ `desoxycorticosterone was 4.3 ng/dL (normal, 7 to
/ z. T; `; J$ `8 ^* t @49ng/dL), 11-desoxycortisol (specific compound S)" |8 @ J6 r, e" c' ^( J
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
& m8 r0 K4 g' wtisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
4 D! e# P9 ^, @: P) J% ~! b* w$ ?testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
- I4 l6 r1 O7 }3 q6 }2 Pand β-human chorionic gonadotropin was less than+ H7 C+ o* N: b- d0 k1 H9 L
5 mIU/mL (normal <5 mIU/mL). Serum follicular
# Y- \% N/ G2 n0 A9 c8 F: M& h8 hstimulating hormone and leuteinizing hormone% W- D7 ~) e. W% y7 M5 [
concentrations were less than 0.05 mIU/mL" g4 v9 e. i0 Y$ B2 q/ g& g
(prepubertal).5 o! m4 P- i# Z7 i! d- C2 _
The parents were notified about the laboratory- A- j8 b2 d4 t0 ~0 C
results and were informed that all of the tests were
9 W. C. K( [* h$ [normal except the testosterone level was high. The
% k' `, A+ N9 V( ?6 vfollow-up visit was arranged within a few weeks to
, S+ O/ I q5 ?2 Aobtain testicular and abdominal sonograms; how-0 g" t. c f/ b5 H1 b' Z
ever, the family did not return for 4 months.
* a- o( s* G+ dPhysical examination at this time revealed that the
) {& T& g" e: |5 [child had grown 2.5 cm in 4 months and had gained
) M; K1 s% j$ i* t2 kg of weight. Physical examination remained1 F5 K2 }" w0 r2 H- o C8 Z) U7 ~
unchanged. Surprisingly, the pubic hair almost com-
7 N- F2 Q# Q( h, X/ t% npletely disappeared except for a few vellous hairs at
& K" D, j. F3 k# ethe base of the phallus. Testicular volume was still 2
; S3 M0 |; F6 n& K, J' a6 kmL, and the size of the penis remained unchanged.; r2 g, F1 c; c$ k) d
The mother also said that the boy was no longer hav-) E# E: R9 J9 e& R0 I3 ?
ing frequent erections.
, R' |7 B0 t6 O$ D+ }Both parents were again questioned about use of% d- T6 G# \% u, v/ f
any ointment/creams that they may have applied to
- R; c+ X! y j/ U l0 Ithe child’s skin. This time the father admitted the8 k0 A) h0 N* m8 h; C& q6 e
Topical Testosterone Exposure / Bhowmick et al 541
& k$ p6 b1 ?% u- ?2 V7 x& }, guse of testosterone gel twice daily that he was apply-
# c; Y, L# J) K m$ n8 H1 a [) `ing over his own shoulders, chest, and back area for) \- j+ t5 Z. o) @) n
a year. The father also revealed he was embarrassed( @9 J, ^: k9 x
to disclose that he was using a testosterone gel pre-
) D. G4 \8 r. P2 [, _; ~# Xscribed by his family physician for decreased libido% \# a( `5 h m/ Q2 l4 K8 M4 G
secondary to depression.$ I* ^, `5 k/ l+ G/ b* P. C s3 b% S
The child slept in the same bed with parents.) B }+ Q: i4 o: F
The father would hug the baby and hold him on his
. @+ |# ?6 ^3 fchest for a considerable period of time, causing sig-: d# k9 v" i" } n
nificant bare skin contact between baby and father.
?0 E |5 X( ^The father also admitted that after the phone call,& E' _/ _) W; Z |
when he learned the testosterone level in the baby2 D- ]) P: ?& e6 Y) I9 Y! B
was high, he then read the product information0 F a/ `( P2 |7 h$ S- S
packet and concluded that it was most likely the rea-
4 k, @6 m8 _9 o0 s" w' p) Zson for the child’s virilization. At that time, they
; n4 ] p1 V/ l5 n8 g- p7 L8 r+ pdecided to put the baby in a separate bed, and the
+ ]1 L0 J! o$ E' j2 x4 P% I/ sfather was not hugging him with bare skin and had5 f1 O- r) C, L" Y4 w+ t2 Q H
been using protective clothing. A repeat testosterone9 W# x1 l4 ?8 ~4 }) X0 p
test was ordered, but the family did not go to the
7 ^# l6 V; `% ~. b8 E" B% |laboratory to obtain the test.6 G& X/ j/ Z& q9 W2 _
Discussion
% ] v! m) t. W9 uPrecocious puberty in boys is defined as secondary6 ^; a. g+ R, y9 s
sexual development before 9 years of age.1,4- @' {2 `+ ] {
Precocious puberty is termed as central (true) when% W. ]: c& i, g% V
it is caused by the premature activation of hypo-/ x5 N1 |; ^1 l! A- z0 N" S2 T
thalamic pituitary gonadal axis. CPP is more com-
$ W1 b2 a: E! r9 ~, Imon in girls than in boys.1,3 Most boys with CPP/ K5 `' Z' J. y, E2 Y
may have a central nervous system lesion that is) O6 Y5 U. v9 ?( j9 ?
responsible for the early activation of the hypothal-
! i9 n6 e9 \( ` _ j5 N. l% Y2 W6 Camic pituitary gonadal axis.1-3 Thus, greater empha-
1 D, K; D1 X6 h! Zsis has been given to neuroradiologic imaging in
4 A* y) ~* S- `1 M0 U* d( a" Q& Q* Zboys with precocious puberty. In addition to viril-
* J7 w2 i4 |& f) c, v& C, Mization, the clinical hallmark of CPP is the symmet-
9 P# K, c q. J! B! u' _rical testicular growth secondary to stimulation by3 S" J3 C* s$ ?0 M1 V" e
gonadotropins.1,3; t5 l' c" ^& B! @ K3 i* O: l( Y
Gonadotropin-independent peripheral preco-8 s1 c0 _5 ^, W8 E. U( k! ^
cious puberty in boys also results from inappropriate4 {( r1 U1 G& ^. u- u8 u% q
androgenic stimulation from either endogenous or
5 j- b: ~0 a- J# h( o/ W5 O) oexogenous sources, nonpituitary gonadotropin stim-
) z) f. @0 M! e/ A" p8 Q( wulation, and rare activating mutations.3 Virilizing$ c; R6 o5 \5 s8 Q) C) C
congenital adrenal hyperplasia producing excessive
3 ~6 M5 r* c+ i6 S/ padrenal androgens is a common cause of precocious
# V* @+ g& F3 ~puberty in boys.3,4# w4 q/ s! D' D3 A$ x
The most common form of congenital adrenal7 I0 p& @* h/ r0 ~- Z- U( D; C
hyperplasia is the 21-hydroxylase enzyme deficiency.
* i1 l8 q: y/ ^( ]The 11-β hydroxylase deficiency may also result in
# R! ^3 C" U, Pexcessive adrenal androgen production, and rarely,
/ z9 ~7 b4 `* A: H0 `6 e# F2 m' ran adrenal tumor may also cause adrenal androgen0 ^9 u8 f- Q9 I+ R+ ^
excess.1,3
& v: ^" m+ L4 E. C# [at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from% P W. m, x# A1 m
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
4 l7 u2 I6 ?0 y3 K+ U5 }0 XA unique entity of male-limited gonadotropin-
: Z- Z9 F1 _: p qindependent precocious puberty, which is also known0 X7 P# m8 Z& a
as testotoxicosis, may cause precocious puberty at a4 L9 L4 d6 [* f$ E4 s
very young age. The physical findings in these boys1 s, k6 S4 l+ t# w- z
with this disorder are full pubertal development,8 S5 p% `* X( z6 c& X% \: O- C' o
including bilateral testicular growth, similar to boys9 U$ b! j: ] U* T
with CPP. The gonadotropin levels in this disorder* t6 p. r; e5 M* ~; Q
are suppressed to prepubertal levels and do not show% `* T9 M, G1 `, A& B* O
pubertal response of gonadotropin after gonadotropin-; Q( ~: U: ~ [5 D0 w
releasing hormone stimulation. This is a sex-linked0 K- p0 t9 Z+ y) B
autosomal dominant disorder that affects only4 O/ Y( D* E; j! V" u# V
males; therefore, other male members of the family; t5 K4 G0 W2 A! j: X
may have similar precocious puberty.3
3 N( L _9 D% u% T5 WIn our patient, physical examination was incon-" ?; v" c+ \9 `8 k+ h
sistent with true precocious puberty since his testi-) v7 W _4 F1 U6 M
cles were prepubertal in size. However, testotoxicosis* e, [8 F- W$ a1 Q+ B+ v' \
was in the differential diagnosis because his father
6 Z( P& ~8 V: |2 u6 A9 @# q7 `. Bstarted puberty somewhat early, and occasionally,
* q/ e3 {. b+ M0 A: N/ S3 ltesticular enlargement is not that evident in the U3 L) G9 J" I3 t/ o$ a
beginning of this process.1 In the absence of a neg-
9 h! M0 c, n2 w3 m) M( A8 J- Rative initial history of androgen exposure, our
; B& K: L' ]3 S# _: dbiggest concern was virilizing adrenal hyperplasia,% H# Z0 u0 A9 u' g5 {2 }3 d
either 21-hydroxylase deficiency or 11-β hydroxylase% j1 h& k0 @7 r( A; w/ d+ J
deficiency. Those diagnoses were excluded by find-
6 F" R: w+ |6 X* W+ a$ Ring the normal level of adrenal steroids.
' q C' Y3 V6 KThe diagnosis of exogenous androgens was strongly
* f+ k, f3 B( Q4 Z/ isuspected in a follow-up visit after 4 months because
) V! w& K( {4 X. R& l) Bthe physical examination revealed the complete disap-" Z' b! S' k; U; p- C4 I
pearance of pubic hair, normal growth velocity, and
1 @1 }* k: L* b' X, z! M; \; ydecreased erections. The father admitted using a testos- X1 m6 m9 d4 Z, V8 H# I- I, j9 Z
terone gel, which he concealed at first visit. He was! Q3 B' ` P. n( C) A+ x' J
using it rather frequently, twice a day. The Physicians’: S7 p; z* l5 {: E3 c) p0 ~
Desk Reference, or package insert of this product, gel or3 k) h6 U3 Z0 @- ]# T! v+ L+ E, J) P
cream, cautions about dermal testosterone transfer to
6 N- Y2 R6 o- e6 l5 g4 |! r7 Zunprotected females through direct skin exposure., e! r2 T0 p+ H6 ^/ i
Serum testosterone level was found to be 2 times the
- T( T5 I1 \$ ]$ z/ Z. }/ pbaseline value in those females who were exposed to* l4 F9 I8 ~ a0 Z; {# g' F+ {
even 15 minutes of direct skin contact with their male' p3 P5 U5 d) Y% a/ m# s( T8 U
partners.6 However, when a shirt covered the applica-
% x7 y% S: q4 ]# Ution site, this testosterone transfer was prevented.
A; T$ ^$ |5 T* n/ ?) G0 COur patient’s testosterone level was 60 ng/mL,3 L. w1 F0 U; z6 m7 |& |9 L* u$ O, H
which was clearly high. Some studies suggest that
. P1 o% F- _$ _1 S3 mdermal conversion of testosterone to dihydrotestos-
% v3 L$ N) E5 a3 \! X$ {terone, which is a more potent metabolite, is more8 W& l. X y m* y. v4 ?
active in young children exposed to testosterone( x! _. S1 S( M$ L" u* t$ ~
exogenously7; however, we did not measure a dihy-
$ M7 {+ E7 u% ^5 U0 k' V- }3 udrotestosterone level in our patient. In addition to
0 z( k! d8 ]. G6 H/ k4 xvirilization, exposure to exogenous testosterone in: N% ? L6 [6 n+ \8 }& ?
children results in an increase in growth velocity and5 D0 _ K; M3 j2 _2 B
advanced bone age, as seen in our patient.0 D2 O& O* Q V4 `
The long-term effect of androgen exposure during
6 o- [8 z8 ~. d% }9 F! l) t* m" @; aearly childhood on pubertal development and final
0 t1 a3 x& X8 `+ Qadult height are not fully known and always remain
- d) B3 V* i& ]0 y f5 ca concern. Children treated with short-term testos-9 G/ e8 ]0 [$ t( P- G3 w) }; B; F
terone injection or topical androgen may exhibit some
/ a k# ?3 A/ {9 X/ P& yacceleration of the skeletal maturation; however, after
% _) Q6 u2 M; E/ L! _cessation of treatment, the rate of bone maturation
& [- D9 ?$ B" P- A# hdecelerates and gradually returns to normal.8,9& {- t; Z i( U D* T
There are conflicting reports and controversy9 n% s9 R" n: d" S7 G
over the effect of early androgen exposure on adult
8 Y3 b; N. z. e/ b% O% G% y) h, Npenile length.10,11 Some reports suggest subnormal/ a$ n0 ]! H) M1 h3 g
adult penile length, apparently because of downreg-
M6 K, x/ \5 }, R `ulation of androgen receptor number.10,12 However,
- e2 I" U3 u' pSutherland et al13 did not find a correlation between3 n1 M) t! m8 @3 K8 l
childhood testosterone exposure and reduced adult
. F v/ b* h$ x9 a) Ipenile length in clinical studies.
9 D; s( Q# v% |, T6 Y4 B$ s0 ]Nonetheless, we do not believe our patient is( f1 t/ u6 u2 i3 N( e$ F/ P% t! p
going to experience any of the untoward effects from3 p4 p3 W6 y2 e
testosterone exposure as mentioned earlier because: }9 M3 i# V& {) p8 y+ c5 _
the exposure was not for a prolonged period of time.
( D- ?* V' O' `, c3 U7 ]Although the bone age was advanced at the time of y. j1 v6 q& }+ Y0 L6 m: o$ k% _
diagnosis, the child had a normal growth velocity at
& o) T# r8 @7 R% Q! P& sthe follow-up visit. It is hoped that his final adult0 R# H3 ^4 Y3 J9 _$ Q& x# C
height will not be affected.
8 ?( @5 B# ^# S. v: A vAlthough rarely reported, the widespread avail-, l% N( k) @- O! J5 T/ Z7 Y
ability of androgen products in our society may
+ s* Q4 i0 M. G' u$ F5 A4 ~indeed cause more virilization in male or female( k8 ~% ?% f; y5 J/ }* R+ s
children than one would realize. Exposure to andro-
. x* \5 t& i; Z, N) @2 \gen products must be considered and specific ques-
- u! n9 ?/ Y$ @+ Qtioning about the use of a testosterone product or
/ ^ ]1 J/ R8 ?5 v& `gel should be asked of the family members during
: t% k D6 q6 D: X$ D B5 @the evaluation of any children who present with vir-
- d! c4 ^$ I8 y! r$ r' wilization or peripheral precocious puberty. The diag-* g* ?" s! ]/ A3 O
nosis can be established by just a few tests and by S3 S' E, d7 ]8 B5 E4 y
appropriate history. The inability to obtain such a
6 U/ ~" K# r8 e& P* T( M( Chistory, or failure to ask the specific questions, may
9 L1 g' F/ Q& b. ], j- M/ V) x- `result in extensive, unnecessary, and expensive
# d' n! Y0 k: d) a) }investigation. The primary care physician should be
' S( p- Q6 @ ?, s' p: r$ maware of this fact, because most of these children
" u2 F* ]6 O. dmay initially present in their practice. The Physicians’3 ^# a" J9 ]$ N4 ? p7 I
Desk Reference and package insert should also put a; |5 C, y' C( M- r
warning about the virilizing effect on a male or
6 g" U1 ?* ]. g1 M$ Qfemale child who might come in contact with some-
9 J$ k. a3 c. K- m* H; R0 zone using any of these products.* J. v) B. ?4 d& _+ [
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% V9 \9 Z9 w2 v& `2 G2002: 565-628.4 N2 O4 ~ V5 _: w6 g' o
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puberty in children with tumours of the suprasellar pineal
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' a9 j# U' Z R# i1 \+ g. }7 Wexposure to testosterone. Pediatrics. 1999;104:e23.
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) p, C! i& \: v1 o' J/ F- UStanford, CA: Stanford University Press; 1959.
V: f- a# B1 U6 m6. Physicians’ Desk Reference. Androgel 1% testosterone,
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