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is a significant concern for physicians. Central
0 q; c$ {+ B Qprecocious puberty (CPP), which is mediated [! A% z: n& i I
through the hypothalamic pituitary gonadal axis, has
( z! o: J) A) @a higher incidence of organic central nervous system+ W1 C7 V6 H* X
lesions in boys.1,2 Virilization in boys, as manifested, H" |9 D4 B0 h0 N* A
by enlargement of the penis, development of pubic
1 ]( W) X9 q6 ~* ihair, and facial acne without enlargement of testi-
1 t) @7 y" f9 i' o" Z7 Ocles, suggests peripheral or pseudopuberty.1-3 We
! f) k* h4 z' `report a 16-month-old boy who presented with the
, l. E' k1 e2 a7 }5 e1 ]enlargement of the phallus and pubic hair develop-
( R5 f Y' w4 G2 y; Hment without testicular enlargement, which was due6 e$ X l% L( E* U' n/ _
to the unintentional exposure to androgen gel used by
9 P, ?; ]5 h2 Q; J4 Nthe father. The family initially concealed this infor-
6 r' `. t4 e! P! ymation, resulting in an extensive work-up for this
+ \3 B$ q; W$ o- q7 Kchild. Given the widespread and easy availability of
' A5 [, h$ s3 N, V+ k3 t- Ktestosterone gel and cream, we believe this is proba-
! \* M7 W2 E1 q0 w1 A& e6 q6 c" x" B' Lbly more common than the rare case report in the
4 ^' w S9 h; Q7 e+ T1 jliterature.4
2 i3 a: L+ F3 o& S6 `9 @Patient Report
9 ]) r* R8 L2 k% D8 NA 16-month-old white child was referred to the
- [5 W e8 z; s" i1 D5 [$ s, Pendocrine clinic by his pediatrician with the concern1 M# R E- a6 v1 T& I; u
of early sexual development. His mother noticed
8 @ Q/ M* J; Q% E& vlight colored pubic hair development when he was
" p4 q; E0 S$ X6 N: R! x2 wFrom the 1Division of Pediatric Endocrinology, 2University of
( y: a7 `! N' @9 XSouth Alabama Medical Center, Mobile, Alabama.
; o1 L/ W3 P4 i' z* PAddress correspondence to: Samar K. Bhowmick, MD, FACE,
$ f+ z4 Q* v4 `$ x# u0 TProfessor of Pediatrics, University of South Alabama, College of; `, e1 E$ V! y) N
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;* ]/ o6 O3 M/ K, O, h
e-mail: [email protected].: v/ i$ S, k! o- M
about 6 to 7 months old, which progressively became& T' Q( y5 v" | Z0 Y* S
darker. She was also concerned about the enlarge-
2 w1 Z: o# e0 r: F/ v6 iment of his penis and frequent erections. The child, k" k) U' }7 \3 w% _. l' T
was the product of a full-term normal delivery, with) T/ |: Q6 h6 i" o5 R( b
a birth weight of 7 lb 14 oz, and birth length of& N1 r& z# U8 |: h) U5 q. R
20 inches. He was breast-fed throughout the first year1 @: B* d; Q8 d8 |
of life and was still receiving breast milk along with
& r; F; o. n/ v% f" xsolid food. He had no hospitalizations or surgery,
& K' y9 N2 {' }# v! Y* t$ |$ F% pand his psychosocial and psychomotor development
$ J' l% Q) k. r7 j- C' Nwas age appropriate.
# i8 z" t. K3 h9 JThe family history was remarkable for the father,
+ R4 V/ T# H: F6 R1 x" Zwho was diagnosed with hypothyroidism at age 16,
) f( c Q- s8 f2 p! G$ L1 `( Gwhich was treated with thyroxine. The father’s
' e3 j: C0 u' N; gheight was 6 feet, and he went through a somewhat
5 V6 @: H5 M+ H$ Gearly puberty and had stopped growing by age 14.
d' w# e2 O6 M* m. Q5 GThe father denied taking any other medication. The
) S- a1 ^ b5 `+ ychild’s mother was in good health. Her menarche
9 X) f5 T# h+ x+ r8 J& \# e% Rwas at 11 years of age, and her height was at 5 feet
% G% n1 h" F% [% u. R5 inches. There was no other family history of pre-
* Y) H3 |1 J5 i& U, P6 `cocious sexual development in the first-degree rela-
* B9 ]0 T7 l& o, H0 Htives. There were no siblings.2 Q8 F) }1 w( ^- v0 Y" c( Y/ H
Physical Examination- C; A& w" g2 k/ w
The physical examination revealed a very active,
' E8 [6 @' Y8 oplayful, and healthy boy. The vital signs documented
4 ~" A& C: r, Z- |4 P A" \a blood pressure of 85/50 mm Hg, his length was) h: s/ L3 K" b, C+ N$ D
90 cm (>97th percentile), and his weight was 14.4 kg
! }1 {6 v* V1 W8 L0 l' x8 u(also >97th percentile). The observed yearly growth
- X: N' V' N9 h$ svelocity was 30 cm (12 inches). The examination of
9 @- U$ t1 W" C% xthe neck revealed no thyroid enlargement.
1 m: D: B j8 ^2 Z) lThe genitourinary examination was remarkable for
& W$ F2 @% w' F% lenlargement of the penis, with a stretched length of
0 u6 T* m7 c2 @9 M, l8 cm and a width of 2 cm. The glans penis was very well
8 W# O9 y7 \! ~* I+ L9 ideveloped. The pubic hair was Tanner II, mostly around
% w: A+ q3 N0 G* d' }540
/ N; q( P# R! t6 b2 X) {at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from V( y; n/ y1 ?, X, V+ e( ?
the base of the phallus and was dark and curled. The
: L# L1 R, K7 _1 V& c/ rtesticular volume was prepubertal at 2 mL each.
9 p" R$ ^8 ~9 S2 y' g9 OThe skin was moist and smooth and somewhat
( S. S: H) k/ x* Loily. No axillary hair was noted. There were no
4 m3 B$ T2 U8 u( J3 x$ `abnormal skin pigmentations or café-au-lait spots.
& A) M# @) ]# b0 A+ wNeurologic evaluation showed deep tendon reflex 2+) b2 S) v; H& S1 |
bilateral and symmetrical. There was no suggestion
& W: z# ]% n& xof papilledema.
2 q( \5 h8 h: L( PLaboratory Evaluation5 f( V3 B" ?6 C5 W
The bone age was consistent with 28 months by% y, d9 S- r0 z/ I! b3 L* u
using the standard of Greulich and Pyle at a chrono-3 _. X: C1 i7 L! p* \' V" B
logic age of 16 months (advanced).5 Chromosomal, _$ \6 l* y l' Z& [
karyotype was 46XY. The thyroid function test- ]9 m$ x% P9 Q0 b. s. K
showed a free T4 of 1.69 ng/dL, and thyroid stimu-7 @- _3 {8 D" @2 r9 d
lating hormone level was 1.3 µIU/mL (both normal)./ U, V- x# E. x0 j/ k
The concentrations of serum electrolytes, blood
6 ?/ h6 w. f2 t. Curea nitrogen, creatinine, and calcium all were7 T9 Q8 T) G& t7 L" A
within normal range for his age. The concentration
" i- x0 ^ m! ]of serum 17-hydroxyprogesterone was 16 ng/dL% ~ f8 H# T0 S9 T
(normal, 3 to 90 ng/dL), androstenedione was 209 g$ ?! a/ a% v6 w- T: T, T
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-# M0 A8 `5 N: `; V+ N0 v
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
3 H5 j( e; m' I0 r: Q: Cdesoxycorticosterone was 4.3 ng/dL (normal, 7 to
* S# i1 O/ L7 j& ~ u) n. H49ng/dL), 11-desoxycortisol (specific compound S)
, `- E& M% [: F+ @) Zwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-( q- i) W$ H9 u) @5 r
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total7 e3 j3 ^3 R; A4 ~6 [
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
: t1 Q! |0 u6 Y) J, ^# Sand β-human chorionic gonadotropin was less than6 O6 Y7 F& ]- P4 Y. {
5 mIU/mL (normal <5 mIU/mL). Serum follicular
6 e! H: Q" ]; r( h$ Fstimulating hormone and leuteinizing hormone
# J |% I- M- m. N6 E5 g4 kconcentrations were less than 0.05 mIU/mL( n; M. l: ?! {5 |/ t: v
(prepubertal).
7 V& m& g4 R- ` V B3 WThe parents were notified about the laboratory
& K8 L- S- h d) gresults and were informed that all of the tests were
6 A7 ?7 l& Q) }6 nnormal except the testosterone level was high. The+ F( B8 Q2 u) v$ P3 A% f/ h
follow-up visit was arranged within a few weeks to, h% y7 J3 t8 s5 Y) f0 q1 b
obtain testicular and abdominal sonograms; how-
+ i9 Q1 T' A0 Q i' p4 N/ D( hever, the family did not return for 4 months.
1 U: ]8 r. }/ XPhysical examination at this time revealed that the+ G/ K1 V0 `$ S3 l
child had grown 2.5 cm in 4 months and had gained, X) L; u( G; ]( ?, O
2 kg of weight. Physical examination remained' r1 c5 j/ j& @. {3 |
unchanged. Surprisingly, the pubic hair almost com-
( A* c" E) m- `8 H4 }$ n& g+ Gpletely disappeared except for a few vellous hairs at
, J S$ e# S- @& pthe base of the phallus. Testicular volume was still 2/ Z [& }) ]( |2 e
mL, and the size of the penis remained unchanged.
5 C1 e z% c4 O1 {The mother also said that the boy was no longer hav-% i$ j- n" f/ {0 D
ing frequent erections.
; f/ x7 W1 Q5 QBoth parents were again questioned about use of
/ o _# F1 s1 {% B( g. q' Z0 }5 dany ointment/creams that they may have applied to+ W1 D, L3 r+ q3 a
the child’s skin. This time the father admitted the3 @3 C) w9 g0 w! T
Topical Testosterone Exposure / Bhowmick et al 541. ?/ i8 w* ^& l- a [" V" `
use of testosterone gel twice daily that he was apply-8 n) ^1 |' e9 u; X) T4 R
ing over his own shoulders, chest, and back area for
# Y" [/ v6 A5 z5 L7 b/ |a year. The father also revealed he was embarrassed
/ u4 \ r: u& B- n5 oto disclose that he was using a testosterone gel pre-
- l$ }. h# h8 |; }: d% L0 Q% S' w# Uscribed by his family physician for decreased libido0 T1 _2 e' z4 e. M/ [8 A* ~& V
secondary to depression.0 U4 O8 B6 G7 i! m% e
The child slept in the same bed with parents.
0 ?' F' O' q9 Z% _, {4 zThe father would hug the baby and hold him on his. y2 D( w' z5 J
chest for a considerable period of time, causing sig-
8 A) _' s$ o# C' O7 x- D: s- [nificant bare skin contact between baby and father.
1 U6 x" d: Q: r4 p/ jThe father also admitted that after the phone call,: H6 A1 b+ i4 [* A$ W+ L
when he learned the testosterone level in the baby5 i' [! ]9 y; `0 Q2 g- B
was high, he then read the product information
3 y0 }# _ Z+ bpacket and concluded that it was most likely the rea-
1 F6 C0 D1 l. W8 v6 n$ `7 X) }son for the child’s virilization. At that time, they
, k- R# h- C4 l& B+ Ddecided to put the baby in a separate bed, and the
) |: h2 \$ N. V7 W1 h' p' tfather was not hugging him with bare skin and had
4 X2 V9 n5 V' e$ K1 P2 P& Rbeen using protective clothing. A repeat testosterone9 Q+ }* D2 A0 T+ ?( U* e! l2 z
test was ordered, but the family did not go to the0 @( E p8 t4 L: _+ ^5 u2 v0 b
laboratory to obtain the test.4 p! q4 U6 p: n, I3 |* Z+ a3 t8 T j
Discussion
' S: c6 O, t4 O( APrecocious puberty in boys is defined as secondary: M- A$ O+ E' v" w
sexual development before 9 years of age.1,4
* b( p, K. q9 R G# ^Precocious puberty is termed as central (true) when
% l* ^0 E2 ?' |- Yit is caused by the premature activation of hypo-3 r9 _4 ^+ F( {# z) J
thalamic pituitary gonadal axis. CPP is more com-
9 G# M: b$ p3 Nmon in girls than in boys.1,3 Most boys with CPP
8 `3 Q1 k5 R Y/ k, k: omay have a central nervous system lesion that is
^" N3 A( J' ? c+ y( s% |responsible for the early activation of the hypothal-5 I8 P4 k' K7 J' a3 \/ r8 B
amic pituitary gonadal axis.1-3 Thus, greater empha-) A, \" }- J! z0 [4 @
sis has been given to neuroradiologic imaging in8 x8 w% a* c" R- Z$ g# ~
boys with precocious puberty. In addition to viril-
# l; |0 g, b+ |5 y: e" b' {0 Mization, the clinical hallmark of CPP is the symmet-8 T* R: m, I$ D+ {) Q2 u
rical testicular growth secondary to stimulation by4 Z& L# t* r( Z6 Q
gonadotropins.1,3/ g- w& j* o) d3 L$ }
Gonadotropin-independent peripheral preco-' a! z. M, N" R1 ~
cious puberty in boys also results from inappropriate) U) r9 @3 ^3 t+ O- n% f
androgenic stimulation from either endogenous or
, k& P) }0 Y; m' F; iexogenous sources, nonpituitary gonadotropin stim-
3 {/ ^0 ~1 R) z; d7 Fulation, and rare activating mutations.3 Virilizing* H# o9 F% Y& l: i1 e; Y3 y
congenital adrenal hyperplasia producing excessive1 t0 P2 Q$ X- t- u* d" V+ f. v
adrenal androgens is a common cause of precocious; F5 t- o% _; o; J* s# I
puberty in boys.3,4
( |, ]* L9 ]6 V4 g7 u* _9 u7 c2 n: P1 o( }The most common form of congenital adrenal' k+ e# r3 w/ M
hyperplasia is the 21-hydroxylase enzyme deficiency.% i, I! ~( @) F3 [
The 11-β hydroxylase deficiency may also result in. n! C' y( Y ~7 b& H
excessive adrenal androgen production, and rarely,
F& h1 j1 N# L0 d0 Ran adrenal tumor may also cause adrenal androgen c$ y" j4 x' y6 ~& N, ~! h
excess.1,3/ l5 F8 J2 j. ~, v" i7 I6 {( F
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from& Y# n' U' O* [0 a# i
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
' ^# V9 ^9 b9 vA unique entity of male-limited gonadotropin-6 V& U% f7 R- @5 L0 X+ J
independent precocious puberty, which is also known
h c$ W& Z+ U" f; m( J& D7 [6 i) T0 \as testotoxicosis, may cause precocious puberty at a/ E- _+ m" ~! t8 A% x7 c" B
very young age. The physical findings in these boys( T7 ^ e% L& F: X% A8 M
with this disorder are full pubertal development,
1 k& J* ?/ }' Z4 w+ C$ Wincluding bilateral testicular growth, similar to boys% S! o6 v2 _4 b+ `1 k
with CPP. The gonadotropin levels in this disorder8 J( D9 F+ o, E) p' N, `3 G
are suppressed to prepubertal levels and do not show
+ e+ N5 G6 v! P, d7 E' e+ Tpubertal response of gonadotropin after gonadotropin-
6 o( y4 ]/ J: r! i8 s" {) J( Jreleasing hormone stimulation. This is a sex-linked
0 B$ n h& T- @autosomal dominant disorder that affects only
( p: H+ p3 H3 y$ b" V+ rmales; therefore, other male members of the family
( {0 ~+ t+ r3 l8 ~% Xmay have similar precocious puberty.3
4 t" d1 P! y m# vIn our patient, physical examination was incon-6 d1 b& f+ f& n$ ~, f
sistent with true precocious puberty since his testi-! ~( I$ l+ c7 T
cles were prepubertal in size. However, testotoxicosis
5 k& B' @* w- J0 A% Awas in the differential diagnosis because his father* u1 Z, c8 V) B9 h$ L
started puberty somewhat early, and occasionally,7 D2 i0 u& j" m& o9 ]5 }
testicular enlargement is not that evident in the; T* g9 G& ^& Q8 y8 S% a
beginning of this process.1 In the absence of a neg-" p: g* j: Z, T) E1 _4 V
ative initial history of androgen exposure, our
* i1 e2 b. S9 Z, @, h: s% b. I$ Hbiggest concern was virilizing adrenal hyperplasia,. R4 T, b# a" P0 V: i
either 21-hydroxylase deficiency or 11-β hydroxylase
! {1 p" r1 I( ?8 ^9 N* |deficiency. Those diagnoses were excluded by find-
4 Z4 n7 ?$ x7 g* U3 L) R! w# a* ~ing the normal level of adrenal steroids.7 }! ^ y1 e- u6 j9 E
The diagnosis of exogenous androgens was strongly
# c) \3 Y9 O* Z2 n% ?; `. v* X; A! ^) msuspected in a follow-up visit after 4 months because
- e9 D; F0 |/ Jthe physical examination revealed the complete disap-
3 }7 ?3 F* T/ e. [3 v; I" v7 Vpearance of pubic hair, normal growth velocity, and
6 ]! Y3 H, j' p+ Z! `, N5 _5 `6 V( b: Tdecreased erections. The father admitted using a testos-$ s! Y7 z+ h8 ]' c2 R8 X# d, Q
terone gel, which he concealed at first visit. He was. Q) o% Y( y1 W6 L+ ^
using it rather frequently, twice a day. The Physicians’
/ _+ B" ^" Y/ J9 O t! V3 E& F. X9 k5 hDesk Reference, or package insert of this product, gel or
! W8 K; @) a4 I9 Y( t' Ucream, cautions about dermal testosterone transfer to
3 ?' m7 b$ S. O, Bunprotected females through direct skin exposure.4 |2 [/ x$ p( |% r" {& A4 Y
Serum testosterone level was found to be 2 times the# Z( P C+ a' X' k
baseline value in those females who were exposed to
% Y( ]. R1 H, K- N, L3 b% Y+ Qeven 15 minutes of direct skin contact with their male+ M5 q/ S3 o* Z j
partners.6 However, when a shirt covered the applica-
7 }) n7 K3 g! `/ f* I) \( S4 j- y& vtion site, this testosterone transfer was prevented.# I+ X8 W( g& s5 T" m! h1 m9 F
Our patient’s testosterone level was 60 ng/mL,% B* \9 ?( j$ y" X* t
which was clearly high. Some studies suggest that+ s) U2 c8 c& e* R: c i
dermal conversion of testosterone to dihydrotestos-
0 ^) P) |. I% c$ w9 |9 j& X$ eterone, which is a more potent metabolite, is more" y X8 m$ w5 D' d; D$ q& X1 ?7 p6 T
active in young children exposed to testosterone
5 c0 q, C' ~4 m o& pexogenously7; however, we did not measure a dihy-' [' f& w# T9 x' @% F7 T
drotestosterone level in our patient. In addition to
2 M+ q: b$ s5 mvirilization, exposure to exogenous testosterone in2 v2 c V, w% p0 Y0 A
children results in an increase in growth velocity and2 I F6 H8 n2 ^+ J0 z: A" X
advanced bone age, as seen in our patient.- ]5 X9 g8 i! P' m' F4 k. a+ i
The long-term effect of androgen exposure during
1 R' [3 k0 F+ P+ Q8 b$ E; H0 fearly childhood on pubertal development and final
' P1 A) c. r& [: v; Iadult height are not fully known and always remain8 ^4 ?; t2 a- ~/ m" f/ O/ d# h
a concern. Children treated with short-term testos-4 A5 W8 L: H) A a9 j
terone injection or topical androgen may exhibit some1 G9 g& i+ V$ F3 p) {* _4 k8 N
acceleration of the skeletal maturation; however, after
: D/ v) H8 j( b: n& m6 Xcessation of treatment, the rate of bone maturation. ]" f) u( \7 Q$ A$ h$ V
decelerates and gradually returns to normal.8,9
2 x* D% Y7 \4 K; @2 mThere are conflicting reports and controversy
0 ?/ o( X! _2 f# k; B/ l/ ]- Bover the effect of early androgen exposure on adult9 _' P: b& @) V$ s
penile length.10,11 Some reports suggest subnormal
: P) w$ n2 p) Dadult penile length, apparently because of downreg-5 T/ E6 b6 ]% g% Y8 B2 f
ulation of androgen receptor number.10,12 However,
0 z. t+ }6 d& L4 fSutherland et al13 did not find a correlation between' _ {3 j# A1 j0 [
childhood testosterone exposure and reduced adult, d9 W9 ^/ e6 y* w9 q7 Y( Q/ y* e: @
penile length in clinical studies.* \$ U" t, i+ _) j+ D9 p! P
Nonetheless, we do not believe our patient is
# k$ r! i5 T8 }1 D9 Mgoing to experience any of the untoward effects from/ Q9 q& P* h2 h
testosterone exposure as mentioned earlier because0 g4 i1 l( E+ f9 W, c7 q# e% k
the exposure was not for a prolonged period of time.
; O2 Q# O# P' N; U- OAlthough the bone age was advanced at the time of
* I; ]* M9 \6 U$ ~# s* Cdiagnosis, the child had a normal growth velocity at
7 L# R1 n9 D6 V8 K- b3 ?the follow-up visit. It is hoped that his final adult
. D b t% ]2 i3 vheight will not be affected., |8 Z: M+ ]0 r$ \7 X
Although rarely reported, the widespread avail-
4 j# t% S& r1 @- {. X2 Q' Kability of androgen products in our society may+ a( p& F7 r& C% [$ [
indeed cause more virilization in male or female
% Y4 t1 }( o4 |3 }6 echildren than one would realize. Exposure to andro-( _$ D! }7 _' M: J
gen products must be considered and specific ques-8 l, W% t! ~9 J; T
tioning about the use of a testosterone product or0 M1 O4 g( Z* {) R; @
gel should be asked of the family members during' w( Z6 n, g' }: N2 }/ I
the evaluation of any children who present with vir-
" s9 v+ \6 C, Uilization or peripheral precocious puberty. The diag-
4 B+ l" Y$ k! u3 z- knosis can be established by just a few tests and by
' r+ z+ R$ Y& j7 W; d/ F" tappropriate history. The inability to obtain such a
$ ]0 \) B& g! R8 M2 ^2 A# Q) s0 s5 Zhistory, or failure to ask the specific questions, may# K2 V6 y- j2 w) h) Y p z' J
result in extensive, unnecessary, and expensive
% C. k2 m8 d. {5 X. k. Linvestigation. The primary care physician should be& `8 K2 P" p2 A0 u E4 O; `
aware of this fact, because most of these children
/ \" n5 c! o9 t0 x* V- X8 s+ C2 @may initially present in their practice. The Physicians’
) @1 q% N. K0 f- NDesk Reference and package insert should also put a6 x' p" {1 E8 l. r1 g+ f& _6 p
warning about the virilizing effect on a male or. I2 D' l8 C1 x: |
female child who might come in contact with some-
8 C9 A2 m+ s, `0 S' c6 fone using any of these products.
0 h6 s9 z. L3 [ U H9 ]2 o$ BReferences
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* ?8 H# g' y, i) b: B# p$ |development in a two-year-old boy induced by topical
5 \5 j# J+ T" e& J9 g* A8 ]exposure to testosterone. Pediatrics. 1999;104:e23.
) }; f3 t1 z V+ C' J5. Greulich WW, Pyle SI, eds. Radiographic Atlas of
$ a' j6 @4 d5 B7 u3 R' M1 iSkeletal Development of the Hand and Wrist. 2nd ed.2 E- n' [% o/ C; a& t1 p
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Economics Company, Inc; 2004:3239-3241.' ?" b" X, B7 c% f
7. Klugo RC, Cerny JC. Response of micropenis to topical1 @% _) |$ V, f* u$ W9 W! \; z
testosterone and gonadotropin. J Urol. 1978;119:' W/ p: T4 \( i/ I# q) I# b
667-668.7 R# A$ Z# @. ?0 S" W3 X
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