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is a significant concern for physicians. Central- \9 I5 B* _3 p8 d5 `5 M
precocious puberty (CPP), which is mediated8 h1 X, i# V- _. T& H+ Z
through the hypothalamic pituitary gonadal axis, has
, H" M( C6 k: D, y# p ~: Oa higher incidence of organic central nervous system
3 S% Y2 g, e& Glesions in boys.1,2 Virilization in boys, as manifested
/ Y7 v- p& M8 ~& zby enlargement of the penis, development of pubic
0 i' o; b' t# N* u+ o! x5 i8 ahair, and facial acne without enlargement of testi-5 [& |; [; n n: b
cles, suggests peripheral or pseudopuberty.1-3 We
/ u) ]9 V; d& \report a 16-month-old boy who presented with the( Y9 O4 S* U9 c& g" N
enlargement of the phallus and pubic hair develop-: J: X7 ]6 P' I
ment without testicular enlargement, which was due4 K4 x b4 D* i
to the unintentional exposure to androgen gel used by2 _% d3 J% c: _" m
the father. The family initially concealed this infor-
* T/ F. ~3 `" U+ l# Bmation, resulting in an extensive work-up for this( B) d# v1 L Y- }
child. Given the widespread and easy availability of* x) W2 V. b! e( a8 G y
testosterone gel and cream, we believe this is proba-
# K0 b. U4 f0 P5 dbly more common than the rare case report in the
: J* e% M/ I+ N8 @! r- Iliterature.4
* ?9 |1 ]7 c/ W) FPatient Report
5 j. [ }" G+ T1 l3 d+ i2 fA 16-month-old white child was referred to the
$ ~& {3 v" V. g7 M- K" jendocrine clinic by his pediatrician with the concern
8 [; u9 o9 x5 l( E" f% C; l# \of early sexual development. His mother noticed
! I7 [3 b3 r- u! [! R% hlight colored pubic hair development when he was/ P! H. r( r! n/ S8 q
From the 1Division of Pediatric Endocrinology, 2University of
, ?0 z* l+ x& S, s% lSouth Alabama Medical Center, Mobile, Alabama.: D0 v8 z/ @0 o+ a; W- y6 _' ?
Address correspondence to: Samar K. Bhowmick, MD, FACE,, x6 u/ z) D. O+ x# K$ i% l
Professor of Pediatrics, University of South Alabama, College of) X1 V& Q& i/ A, R
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
' L; K9 `' P0 n1 Ae-mail: [email protected].4 t( T6 u) {3 u
about 6 to 7 months old, which progressively became7 P0 U5 o; z8 _, [& n$ G7 G1 S3 k
darker. She was also concerned about the enlarge-
& u! F* r. ~: V$ I- y7 Iment of his penis and frequent erections. The child
% M/ E# \( u' `- J' }, Vwas the product of a full-term normal delivery, with
$ h& ^ w r" X4 B+ i9 H' H. V" sa birth weight of 7 lb 14 oz, and birth length of$ B4 t; H G6 Q1 c8 r1 \1 [
20 inches. He was breast-fed throughout the first year, Z2 _! @, V: C
of life and was still receiving breast milk along with3 D8 X& m, M$ J! r# E' U
solid food. He had no hospitalizations or surgery,3 K3 L; [ t. R7 }8 ^+ @
and his psychosocial and psychomotor development% Y# W/ t7 d3 w7 j1 q
was age appropriate.
; ^3 q' Q# G3 y. a6 D1 ~7 h, }6 G: ?8 AThe family history was remarkable for the father,
+ P; D6 y- }, l) V1 d7 J) A0 J( awho was diagnosed with hypothyroidism at age 16,% P$ m0 E6 O5 ^$ p! J( C
which was treated with thyroxine. The father’s( d% \/ r, P2 o3 {/ q
height was 6 feet, and he went through a somewhat
8 F% X* A% c9 w+ {8 a. H8 Qearly puberty and had stopped growing by age 14.
* l, j7 s; _% ^& `3 a' H2 vThe father denied taking any other medication. The
7 H4 |2 u2 K. e* e9 V. jchild’s mother was in good health. Her menarche% `1 n& r! L" a2 t: p3 Y5 O
was at 11 years of age, and her height was at 5 feet
7 J$ X" X/ i2 {1 M" L5 inches. There was no other family history of pre-: e7 \" ]4 X! A
cocious sexual development in the first-degree rela-
G; T6 a& @7 b1 B4 ?/ |tives. There were no siblings.
3 N5 s, Y# d. i1 @8 N# tPhysical Examination
+ m' x( u) @$ f* |$ R- f( p2 lThe physical examination revealed a very active,
! E6 `8 P0 O+ J1 O/ ?, zplayful, and healthy boy. The vital signs documented
. |! H2 G# Q2 R- F5 o" {a blood pressure of 85/50 mm Hg, his length was
0 c; y4 q& t, O' v3 l90 cm (>97th percentile), and his weight was 14.4 kg8 h0 k' l( [& R d
(also >97th percentile). The observed yearly growth" W: P; }0 ~! U1 r! o
velocity was 30 cm (12 inches). The examination of
1 H, ^: W/ H" Q$ tthe neck revealed no thyroid enlargement.
7 N6 l2 m7 {4 c' Q0 \% FThe genitourinary examination was remarkable for' [( K& P' h! d: [- Y& v
enlargement of the penis, with a stretched length of; i( @/ E F: K
8 cm and a width of 2 cm. The glans penis was very well9 q! B+ E0 E: V i
developed. The pubic hair was Tanner II, mostly around1 R- f' p0 U* h1 |
540: v: i' N. g" x7 n) a, J
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from/ ]/ Q4 D$ n* b Z% X+ e j
the base of the phallus and was dark and curled. The( ?+ F; _- r- J0 \$ P$ S4 f, W; D, u# Q% f
testicular volume was prepubertal at 2 mL each.
3 U; l( p4 G5 M: u3 O, T" HThe skin was moist and smooth and somewhat
+ k, O6 B# W+ b* boily. No axillary hair was noted. There were no- N( e( l+ m' V J1 V0 {
abnormal skin pigmentations or café-au-lait spots.
2 b( L; q9 m# W# N; u9 ANeurologic evaluation showed deep tendon reflex 2+( W1 m$ [5 K* s8 h- T
bilateral and symmetrical. There was no suggestion
1 x$ D$ D8 W1 z6 g3 H# ?of papilledema.1 F2 z& x5 A% A- [: O" x
Laboratory Evaluation3 z! W) T2 @% A3 B$ S( r6 B7 C5 l
The bone age was consistent with 28 months by& Q, p" k/ ]* P2 Z3 I8 B/ M
using the standard of Greulich and Pyle at a chrono-
; V+ Z; k, d; p% C% [logic age of 16 months (advanced).5 Chromosomal+ v! W& B, p' o5 F. S2 B+ f
karyotype was 46XY. The thyroid function test. s5 }( M, f; D! n6 o4 A
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
' p1 g4 E# ~( H( K* H0 flating hormone level was 1.3 µIU/mL (both normal).& U# s; B1 D o# y
The concentrations of serum electrolytes, blood
. `. N1 K4 x+ Y$ ourea nitrogen, creatinine, and calcium all were1 H0 G7 b6 N; D1 o
within normal range for his age. The concentration
2 [: _2 H w1 `of serum 17-hydroxyprogesterone was 16 ng/dL( ?3 T/ Z/ D! n
(normal, 3 to 90 ng/dL), androstenedione was 20
& w8 q" v/ x; I g6 ?ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-9 f4 P5 x6 f: F
terone was 38 ng/dL (normal, 50 to 760 ng/dL),6 w) i0 O; `4 G: O
desoxycorticosterone was 4.3 ng/dL (normal, 7 to3 d/ j2 s _# ?
49ng/dL), 11-desoxycortisol (specific compound S)6 q, Y- L; d; B" H ?
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-: N, @0 C! s& ^6 ~5 @2 K8 a
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total7 k- P5 J- v+ C! |0 F4 L, \
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
8 C* b7 X; }8 L4 z( `% tand β-human chorionic gonadotropin was less than
5 u0 O* t) C& a, p w# z5 mIU/mL (normal <5 mIU/mL). Serum follicular P$ Y) u. o( t6 J
stimulating hormone and leuteinizing hormone0 T" F3 o+ D- H% ]% \) ?( U6 K; {
concentrations were less than 0.05 mIU/mL; t/ n1 }3 j+ |, e3 [' U0 |
(prepubertal).
7 i( v% u; i; R0 W5 x6 C$ q* hThe parents were notified about the laboratory
) F [6 |0 O% q* c- w; _results and were informed that all of the tests were$ Z/ \( {5 a: \5 W& X' l
normal except the testosterone level was high. The
5 @( V. [* x6 v( ]; Afollow-up visit was arranged within a few weeks to
$ R# R% g, C( V7 R0 Eobtain testicular and abdominal sonograms; how-- ]$ R7 h V; b
ever, the family did not return for 4 months.
9 A% M2 b B1 {Physical examination at this time revealed that the2 V. A! ~. [- ~. z* Z
child had grown 2.5 cm in 4 months and had gained: q0 w) s6 q2 z8 Y/ X* C
2 kg of weight. Physical examination remained; j$ R* ^6 v1 W" V
unchanged. Surprisingly, the pubic hair almost com-" q2 L. g1 {5 E# V; Z5 ]* ^9 `
pletely disappeared except for a few vellous hairs at! l8 v8 ?% x4 {6 P7 {
the base of the phallus. Testicular volume was still 2
" o2 I# C5 ~8 d3 p9 zmL, and the size of the penis remained unchanged.
) Y. T( q0 K# d6 T' ^+ NThe mother also said that the boy was no longer hav-
9 X, h3 T5 Q3 H. S3 P }3 ving frequent erections.
9 X- h) a6 H, k; nBoth parents were again questioned about use of" R L z. L& H
any ointment/creams that they may have applied to
5 a" Z* b e, l7 pthe child’s skin. This time the father admitted the2 }5 ]6 Z4 Y1 u" B/ C0 `
Topical Testosterone Exposure / Bhowmick et al 541
: {7 x5 D' X, {use of testosterone gel twice daily that he was apply-- I& i6 }' K; G5 @2 V P
ing over his own shoulders, chest, and back area for
$ p; c' }( N; {a year. The father also revealed he was embarrassed
8 U; ~6 _/ U7 Q1 ]to disclose that he was using a testosterone gel pre-* t9 X! ^. c* X0 r$ M' v% W
scribed by his family physician for decreased libido/ V2 G) o$ R1 c+ S4 }5 _
secondary to depression.. P8 U5 }* F: L1 `# k
The child slept in the same bed with parents.* C: |* Q: H: i6 }$ {
The father would hug the baby and hold him on his/ E& V: G* m/ ~$ c3 l
chest for a considerable period of time, causing sig-, r2 s9 g- `3 V
nificant bare skin contact between baby and father.4 y( B8 O' g) I" A# a$ C+ v) \
The father also admitted that after the phone call,
# Y) D" R; E3 J; pwhen he learned the testosterone level in the baby
! ]" d4 I7 R# L! K+ u) j: qwas high, he then read the product information: X! B" ^0 ]8 O7 z
packet and concluded that it was most likely the rea-
$ m9 j: Z8 x" Pson for the child’s virilization. At that time, they% _! n: x" Y0 w c: W4 P E
decided to put the baby in a separate bed, and the0 x( e, t' L* a9 O! ~- m8 N- X% K
father was not hugging him with bare skin and had. M# E$ `' C* I& W3 S
been using protective clothing. A repeat testosterone
7 d" A- j& U$ ]test was ordered, but the family did not go to the- f: G! r( a+ u& j; n
laboratory to obtain the test.
- I/ Y* f0 w1 Y- d! O& q$ ]Discussion
8 b) {7 }* z' _# E7 WPrecocious puberty in boys is defined as secondary
4 v. t0 n! R1 bsexual development before 9 years of age.1,4
, g% Q: e, V4 i. c2 _' U6 APrecocious puberty is termed as central (true) when
$ M) s1 r1 a6 H: e- A# mit is caused by the premature activation of hypo-: Q2 R% }( `0 X; m( m. `3 a
thalamic pituitary gonadal axis. CPP is more com-, z2 ~/ J; e @4 V3 x& V3 u
mon in girls than in boys.1,3 Most boys with CPP- G3 C* E# C8 ^* `) e7 b: n+ C
may have a central nervous system lesion that is% u7 v2 s; P' v7 a
responsible for the early activation of the hypothal-
3 j4 s: c* m1 r( ~: H3 q: J5 c% samic pituitary gonadal axis.1-3 Thus, greater empha-: v" S% Z* D" p6 z* U
sis has been given to neuroradiologic imaging in
" e3 ]/ M- E0 B$ k! H7 o9 [: c- Rboys with precocious puberty. In addition to viril-
) r7 y6 v" s ]* J, Gization, the clinical hallmark of CPP is the symmet-
7 X* G" s& F7 g. @rical testicular growth secondary to stimulation by( O4 z# U& T) a. j1 l ?
gonadotropins.1,3+ k2 {# y9 l! i" `/ L
Gonadotropin-independent peripheral preco-
z5 K. o) J: Y- kcious puberty in boys also results from inappropriate
9 f( K3 h) l" m E9 bandrogenic stimulation from either endogenous or
3 X2 s0 M5 D! L6 X) L+ D0 rexogenous sources, nonpituitary gonadotropin stim-/ v E5 Q, Y+ K" N( `
ulation, and rare activating mutations.3 Virilizing
p* S. F" x2 o ]- {' Z# qcongenital adrenal hyperplasia producing excessive0 _1 v0 p8 p3 x0 l" D s" b7 h, W
adrenal androgens is a common cause of precocious% W9 F& U+ [1 O
puberty in boys.3,4# ~0 F c" i5 H: M" q$ s% {
The most common form of congenital adrenal
! l; H8 F( w8 r7 C9 j* ]" c9 N+ y: }hyperplasia is the 21-hydroxylase enzyme deficiency.7 q( ^7 B7 D4 l
The 11-β hydroxylase deficiency may also result in9 T8 }4 W J9 C: O( M# C& o
excessive adrenal androgen production, and rarely,
* q& M$ K$ ^$ W! C& T* V$ Fan adrenal tumor may also cause adrenal androgen
1 K$ P; _% j0 L! M5 t4 hexcess.1,3
) D0 R. ?. p, ^- [1 {0 Eat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
6 {, X1 i0 T. Z, y; R542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
3 {( z: e/ `) O) Y$ o! O6 L" h! LA unique entity of male-limited gonadotropin-$ |" o8 y3 g5 W) A: d. h
independent precocious puberty, which is also known
4 d2 Q3 @9 X' z* v% L. V' L6 \' Zas testotoxicosis, may cause precocious puberty at a+ m& I0 P; n A2 N2 v7 ]
very young age. The physical findings in these boys
$ J+ s% h7 q9 O; x& Y. dwith this disorder are full pubertal development,' z9 C8 C' }3 K4 g: k# D6 N
including bilateral testicular growth, similar to boys
7 ?, e' r8 |) X+ \with CPP. The gonadotropin levels in this disorder% o3 Q1 ~+ \, K* y- J8 j6 l& |8 W
are suppressed to prepubertal levels and do not show* W# A0 X4 t6 |+ G
pubertal response of gonadotropin after gonadotropin-
" u5 s2 k3 q& \releasing hormone stimulation. This is a sex-linked
% D1 a" }# k& Aautosomal dominant disorder that affects only
! P! k* f) a* r; u% ]males; therefore, other male members of the family) P; `; f! o- c$ x' H
may have similar precocious puberty.3
0 A" `; ?3 b, @2 ZIn our patient, physical examination was incon-
5 r0 _# c8 F1 n$ [8 ysistent with true precocious puberty since his testi-' ]8 b$ N/ s/ @
cles were prepubertal in size. However, testotoxicosis
" u$ g( H# W8 N. P9 l$ vwas in the differential diagnosis because his father8 ~' X7 t. ~2 M( F, o t7 O
started puberty somewhat early, and occasionally,
& r* I) g' Y: Htesticular enlargement is not that evident in the
6 \* `3 a1 q2 f- U' ?. n. Hbeginning of this process.1 In the absence of a neg-
; y7 _" t( k4 T/ v7 d% c5 aative initial history of androgen exposure, our
( Z9 v% L+ Z" m: Gbiggest concern was virilizing adrenal hyperplasia,9 I( O& n! q% E1 U3 b- A& s& L: i
either 21-hydroxylase deficiency or 11-β hydroxylase4 n8 W1 T9 w' b( V- o
deficiency. Those diagnoses were excluded by find-
$ K( l- H" T) w+ G+ `2 oing the normal level of adrenal steroids.
8 K1 R3 J5 P! v% `The diagnosis of exogenous androgens was strongly+ x0 A7 X0 y$ a. x9 ~; i2 z
suspected in a follow-up visit after 4 months because5 e. k1 }# F/ D# J) M
the physical examination revealed the complete disap-
& v( a* X0 k$ B- J0 h8 ?pearance of pubic hair, normal growth velocity, and
' ?: Z9 u# j0 q9 Adecreased erections. The father admitted using a testos-
2 K# n& a, j2 z* `0 [2 t' aterone gel, which he concealed at first visit. He was1 G- e0 j$ D6 S) _7 A
using it rather frequently, twice a day. The Physicians’8 [% T9 e0 e9 F8 f/ D) k; d: ~3 b
Desk Reference, or package insert of this product, gel or
i( L$ ?# l* ~cream, cautions about dermal testosterone transfer to! \( `+ Q' O& J) S. C5 }) c6 M' r# m
unprotected females through direct skin exposure.
2 y1 @, O7 }* D% f7 F! _ l2 eSerum testosterone level was found to be 2 times the
6 f0 }( k4 _' z! g9 mbaseline value in those females who were exposed to
+ a6 J$ a% S/ k+ F0 Weven 15 minutes of direct skin contact with their male
) Z; ?. p, P: a2 \: m2 G; Z- Upartners.6 However, when a shirt covered the applica- t6 q& f4 S8 u/ @3 c- |" k
tion site, this testosterone transfer was prevented.
" [8 W3 r+ t. i0 D: OOur patient’s testosterone level was 60 ng/mL,
$ P" J( ^ k/ F3 ~which was clearly high. Some studies suggest that
$ S' ^+ B# n- i% N+ `& Vdermal conversion of testosterone to dihydrotestos-
$ t# b! x2 u9 Z" `! Aterone, which is a more potent metabolite, is more# ?" g* e) E/ Z6 Q; H; @
active in young children exposed to testosterone0 @' Y( K* X8 b# s
exogenously7; however, we did not measure a dihy-
% j# F9 \4 S) U8 a9 F! E2 Ddrotestosterone level in our patient. In addition to7 I& ^' M# ]$ x% o" S# s
virilization, exposure to exogenous testosterone in& @2 \, P* |7 F* A. W2 U
children results in an increase in growth velocity and
9 B/ u& L8 l7 f8 E. Q! Vadvanced bone age, as seen in our patient.1 e) w. ]( u6 S& R6 H( j+ e
The long-term effect of androgen exposure during5 Q1 h$ P J/ O
early childhood on pubertal development and final
* L5 h/ e9 ] J' o5 Z. y5 X# Q/ _adult height are not fully known and always remain
7 j W- p: j! Z; P- c& Ya concern. Children treated with short-term testos-
) U% i- a$ t5 a' E& q6 Vterone injection or topical androgen may exhibit some
4 S7 v3 ?/ A7 ~acceleration of the skeletal maturation; however, after
. g% I8 s7 o5 e/ S0 y9 T9 @cessation of treatment, the rate of bone maturation
6 G- i0 ~ D* ]& F8 B5 ?* C* u- [decelerates and gradually returns to normal.8,9
& u) P; Z, g/ ~4 M: U Q- d! f8 ^There are conflicting reports and controversy, u1 B8 X- E' _" M4 ]) [: v
over the effect of early androgen exposure on adult$ R6 h ]7 a+ R! E$ @
penile length.10,11 Some reports suggest subnormal
& B" H* }* d# b/ v4 x6 C3 Wadult penile length, apparently because of downreg-
, x1 J. L2 @6 `% o2 L D+ m7 |2 g/ v# julation of androgen receptor number.10,12 However,# J9 `% }* S F
Sutherland et al13 did not find a correlation between
6 d- @/ i) A2 k) a. ~; R2 z# Jchildhood testosterone exposure and reduced adult
4 I2 Y1 ]: @2 I+ zpenile length in clinical studies.. ^% b8 i# H2 @: A2 v2 q
Nonetheless, we do not believe our patient is& F; S# t: N9 z7 J* y( a/ W
going to experience any of the untoward effects from
# q0 S2 h X k/ p. d rtestosterone exposure as mentioned earlier because
9 Z4 j7 O3 f' e6 \7 zthe exposure was not for a prolonged period of time./ ~) F3 \/ K6 \/ l
Although the bone age was advanced at the time of
2 s3 q O V, @diagnosis, the child had a normal growth velocity at
: t% U2 { l% U( n* uthe follow-up visit. It is hoped that his final adult
9 c- n, y8 X+ Dheight will not be affected./ K1 V( S4 |: f6 m- P8 h4 `: e
Although rarely reported, the widespread avail-, ~. l: f4 i# P* Z+ L" D( _) E$ C
ability of androgen products in our society may
8 V% |; ~% Z) A; k1 h iindeed cause more virilization in male or female G' ]) Y0 E9 R. A
children than one would realize. Exposure to andro- g' {! K8 P+ _$ B. O: Q7 {- ^
gen products must be considered and specific ques-' W; M6 s! ?$ G+ S: i4 d
tioning about the use of a testosterone product or
0 D# m+ ]5 X* S/ A( g! z# i1 Ugel should be asked of the family members during/ W" `9 h I+ {! Z5 f9 B0 W
the evaluation of any children who present with vir-
- {& K7 b7 K. e: ]; S- P9 [! A2 i8 ]ilization or peripheral precocious puberty. The diag-7 t. i$ Y! U9 v6 U) y+ {" N
nosis can be established by just a few tests and by4 K' T4 I# g% p1 u; ~$ c
appropriate history. The inability to obtain such a
# a2 {. W+ v$ p8 f' k1 Jhistory, or failure to ask the specific questions, may
- u. X( x' a5 iresult in extensive, unnecessary, and expensive
7 _$ C7 [9 K$ p: D! V+ Cinvestigation. The primary care physician should be6 G# i* O1 M1 a4 m: T& Q, B3 n
aware of this fact, because most of these children
' `9 c+ ^# V1 Z. ]may initially present in their practice. The Physicians’
) W5 Q* ^# i: h+ `# l2 U0 U% SDesk Reference and package insert should also put a
+ |; |& H7 g C& b/ V) Dwarning about the virilizing effect on a male or
" d) G9 U8 k# c* X( t0 l0 r" Mfemale child who might come in contact with some-
D, |1 r7 X" ?( N* L, |7 E/ o7 Jone using any of these products.
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2002: 565-628.6 @! J" A+ B! R
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious1 p0 f; r+ O* ^: q/ n( z {- N' z) Q
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! A% L3 d5 j( |: j' Jareas: organic central precocious puberty. Acta Paediatr.
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' q0 x+ d( f. E) Y& oexposure to testosterone. Pediatrics. 1999;104:e23.5 r; G6 Q. I3 q$ s" h' O
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Stanford, CA: Stanford University Press; 1959.* x1 Z6 a# {1 m+ M$ v
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Economics Company, Inc; 2004:3239-3241.7 x% v$ n4 [8 a0 R: W& w
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7 o, k- Q% p- H: q' ltestosterone and gonadotropin. J Urol. 1978;119:' W1 d+ V5 h. V9 ?6 Q
667-668.+ U8 n& Z) J: h6 z" L; F
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