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is a significant concern for physicians. Central
3 O% l% o+ ~( E, n( w1 [% }" oprecocious puberty (CPP), which is mediated) B' V1 S& y7 m
through the hypothalamic pituitary gonadal axis, has$ r7 f; b) f9 `& L
a higher incidence of organic central nervous system# }* }# X: m8 }0 ~% `& X
lesions in boys.1,2 Virilization in boys, as manifested& o6 E& x' d/ \2 u3 b+ J8 S" y6 B, }: J
by enlargement of the penis, development of pubic" r: k* M2 Z! S) d B
hair, and facial acne without enlargement of testi-
; m, {! L2 h( _) v" p5 A icles, suggests peripheral or pseudopuberty.1-3 We$ u$ x; Q0 f7 U" A0 e, j
report a 16-month-old boy who presented with the
% \3 R/ B! L3 D; O- c( `6 Henlargement of the phallus and pubic hair develop-
+ z) B5 c$ t+ `! A) Dment without testicular enlargement, which was due
3 m) l2 \) t) h2 E' uto the unintentional exposure to androgen gel used by# T0 W R3 E) p8 }& L
the father. The family initially concealed this infor-
3 n1 @! l) f3 q* x6 \* Amation, resulting in an extensive work-up for this
; P. a ]- I( |child. Given the widespread and easy availability of
% s# R% E6 K6 p' E( P9 htestosterone gel and cream, we believe this is proba-- ~, Y L" j$ S; ^2 `; h4 J' H
bly more common than the rare case report in the5 z7 n, C) j4 U/ E! A
literature.4
$ F0 v- _7 {, B$ [Patient Report @0 _- T# d4 k" {( }
A 16-month-old white child was referred to the$ |( b0 Q% ^# w4 m0 b( P
endocrine clinic by his pediatrician with the concern
$ K. }" a1 Y3 _, j! \of early sexual development. His mother noticed7 w" E5 X0 e) b
light colored pubic hair development when he was
# z6 U: w5 K/ ~/ O) aFrom the 1Division of Pediatric Endocrinology, 2University of# j2 [7 i" i- {9 h) g) y
South Alabama Medical Center, Mobile, Alabama.& G' p) I, P. {1 ]+ ]8 U8 x
Address correspondence to: Samar K. Bhowmick, MD, FACE,
7 A' W2 n3 h8 FProfessor of Pediatrics, University of South Alabama, College of
! m, a$ Q( X4 `' ~6 e; ]) W# KMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;) p7 c {( _3 x1 p
e-mail: [email protected].
0 k6 X. B" F7 D* L2 ~: r1 Tabout 6 to 7 months old, which progressively became
; O5 g" G1 s q* n+ p- bdarker. She was also concerned about the enlarge-
) O* A, @( _- C/ Z8 w% hment of his penis and frequent erections. The child4 w* N/ |& R& }# O! E7 j& S
was the product of a full-term normal delivery, with
U) I8 p4 E4 J2 }a birth weight of 7 lb 14 oz, and birth length of
5 E7 C# \/ E5 t1 }- k" d20 inches. He was breast-fed throughout the first year
* q8 r( \7 F3 ^. ^: a; l3 wof life and was still receiving breast milk along with* g9 t% w$ x; h
solid food. He had no hospitalizations or surgery,- r* P0 t% N: j! n2 B( b: A
and his psychosocial and psychomotor development
; N1 K# W6 E% A: ]was age appropriate.
0 p( A. m: T$ F9 p5 R8 Q" R, rThe family history was remarkable for the father,+ h$ Y9 b' B1 H0 m& A8 ]! d
who was diagnosed with hypothyroidism at age 16,
m4 N& m- ~9 S+ x) x8 h9 Wwhich was treated with thyroxine. The father’s
- a/ K/ f! Y n! D( T7 y: Z" U* ~height was 6 feet, and he went through a somewhat8 |9 V5 D; H8 A0 I3 Z: D% e
early puberty and had stopped growing by age 14.! V }6 v) ~- W9 v
The father denied taking any other medication. The
1 m. q9 u, `: P* q4 y2 vchild’s mother was in good health. Her menarche
0 F; p$ P# {' g% J" p: Kwas at 11 years of age, and her height was at 5 feet- P* H/ U4 v {' c' B# g( I; {1 t
5 inches. There was no other family history of pre-& e ~# a5 G. n2 z
cocious sexual development in the first-degree rela-
/ X1 `. R9 Y/ b) c8 C' ~* Ltives. There were no siblings.' `( W' q6 s' U
Physical Examination
& y, N8 Y0 T/ V' g) DThe physical examination revealed a very active,, M# | N. l* b# a+ |
playful, and healthy boy. The vital signs documented+ t( p9 S9 ^/ m8 ?
a blood pressure of 85/50 mm Hg, his length was n- H" U! Q# i6 r9 k
90 cm (>97th percentile), and his weight was 14.4 kg
0 U9 Q8 U* n9 x h(also >97th percentile). The observed yearly growth9 W% [" i5 F" I" J* ~$ {1 {
velocity was 30 cm (12 inches). The examination of2 c6 O2 A& B* F
the neck revealed no thyroid enlargement.& _% Y z, M4 u* W
The genitourinary examination was remarkable for
+ y) R0 S, N" \+ e6 qenlargement of the penis, with a stretched length of/ S- \+ q, q i( F) R: L$ f* r
8 cm and a width of 2 cm. The glans penis was very well4 x. Z8 T% _7 B! E: O( |
developed. The pubic hair was Tanner II, mostly around0 p* i1 K5 X8 d8 h9 m2 ^
540
# U# }' ~( e+ l; G8 @$ Aat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from5 A; M! s- M3 Y2 _( G" K
the base of the phallus and was dark and curled. The
- b* m5 l0 ]( Z, H$ m$ i; @testicular volume was prepubertal at 2 mL each.3 c. U+ r# j( e; k( G* J
The skin was moist and smooth and somewhat2 f7 _3 C8 j4 z5 u
oily. No axillary hair was noted. There were no
1 F# J2 k; ^) f Cabnormal skin pigmentations or café-au-lait spots., x- b1 B" P4 o, ]& ?% J8 F5 P7 o0 @
Neurologic evaluation showed deep tendon reflex 2+' R. a* B: a/ @9 V
bilateral and symmetrical. There was no suggestion
6 C P" w& r& \( D/ ~2 vof papilledema.
* o8 y+ e) N% Y m+ M2 iLaboratory Evaluation7 e2 f# |8 g, m1 i9 j5 h- I
The bone age was consistent with 28 months by9 I! i- |& A9 B0 u
using the standard of Greulich and Pyle at a chrono-
2 h- u/ [) T5 u0 Q+ Alogic age of 16 months (advanced).5 Chromosomal
( A% p, \1 U [5 ?/ {karyotype was 46XY. The thyroid function test
H; V6 k/ ~% S" }9 |showed a free T4 of 1.69 ng/dL, and thyroid stimu-
- o0 E4 m: R! D% O7 flating hormone level was 1.3 µIU/mL (both normal).: Q' b" s& ^$ i+ ~
The concentrations of serum electrolytes, blood4 i3 a) X A. r5 z4 X
urea nitrogen, creatinine, and calcium all were) ], W- P9 ^, G
within normal range for his age. The concentration0 s; X k9 M$ s
of serum 17-hydroxyprogesterone was 16 ng/dL B: @* D: j- `2 f6 S8 O$ u$ N1 g
(normal, 3 to 90 ng/dL), androstenedione was 206 U: u) s4 W+ s" t3 p
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
6 \' O0 w! P! U+ k/ Iterone was 38 ng/dL (normal, 50 to 760 ng/dL),. C7 [6 I2 _: t) w( Y
desoxycorticosterone was 4.3 ng/dL (normal, 7 to) t, C" W) v$ r" a
49ng/dL), 11-desoxycortisol (specific compound S)
8 i5 T3 ~' Y' c4 lwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
4 N5 d" P: H2 |" ltisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total2 y0 Q3 Y8 b: Y
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
" |2 @# [% k2 _! gand β-human chorionic gonadotropin was less than
* t) |7 t6 l0 c5 mIU/mL (normal <5 mIU/mL). Serum follicular; b% `+ H' v" V
stimulating hormone and leuteinizing hormone0 s. s- w* ?* B+ G
concentrations were less than 0.05 mIU/mL, |4 w% Z% A' {, d4 U
(prepubertal).6 v. E$ I# @' h; _
The parents were notified about the laboratory
$ M2 b n t# w% t; [$ H8 [results and were informed that all of the tests were! J Q& ^4 l+ s+ c
normal except the testosterone level was high. The- ^3 p1 Y2 P5 v( d! H
follow-up visit was arranged within a few weeks to
7 E1 A4 U5 p) ?& o$ k- M+ b' i0 bobtain testicular and abdominal sonograms; how-
\+ r) _' {, L" I9 @ever, the family did not return for 4 months.
! w4 {7 T \; J) |! ?: pPhysical examination at this time revealed that the; @6 }, ~4 `- P
child had grown 2.5 cm in 4 months and had gained
9 r9 A1 N4 a( r$ |1 Y2 kg of weight. Physical examination remained
* O/ v0 i, v+ X, a% Q( y0 A1 Punchanged. Surprisingly, the pubic hair almost com-
- x. }' C. |" e, P# Y0 Zpletely disappeared except for a few vellous hairs at
$ h: h6 Q( C) v Xthe base of the phallus. Testicular volume was still 2 u4 ^2 P8 B! D% i4 L; x" \9 @
mL, and the size of the penis remained unchanged.
! n0 o# l9 T9 K5 S, u8 hThe mother also said that the boy was no longer hav-4 a- ]. G$ ]) |) j0 A
ing frequent erections.
( R4 r7 Q$ }, z ~Both parents were again questioned about use of8 K% S' W, Z0 L8 V- L
any ointment/creams that they may have applied to
! ?- g. d- v! R9 t- V8 t6 F4 q' ^2 R# tthe child’s skin. This time the father admitted the
5 G+ X) N/ u# t d0 e, |6 OTopical Testosterone Exposure / Bhowmick et al 5414 }6 l3 m8 [; F4 z6 E9 T. _
use of testosterone gel twice daily that he was apply-/ H# `+ O. B& L
ing over his own shoulders, chest, and back area for
3 b: ]6 H, H0 k6 |a year. The father also revealed he was embarrassed! R& Q" h8 ~+ Z* j
to disclose that he was using a testosterone gel pre-
5 M9 z# {% j7 C/ n) hscribed by his family physician for decreased libido
9 S% V" a6 O u8 A4 j! ksecondary to depression.
& D7 n' K+ ?- A& l+ q# LThe child slept in the same bed with parents./ E5 t9 K1 m0 G2 |: S# a
The father would hug the baby and hold him on his* p2 o/ q( |% k8 c# }3 B. |
chest for a considerable period of time, causing sig-+ a: h: z2 g6 d0 q: P) Q! d
nificant bare skin contact between baby and father.0 g7 f3 X# [9 M% J
The father also admitted that after the phone call,
. y$ t( h( k0 ewhen he learned the testosterone level in the baby
+ H% x( G" R* y" ~4 `was high, he then read the product information
, R& [. ^' \% D; A5 Ipacket and concluded that it was most likely the rea-* ?, z0 {0 D( }6 I ?
son for the child’s virilization. At that time, they
! B( d- M$ F8 U* j7 ~: ]decided to put the baby in a separate bed, and the
3 t+ |# k+ Z* Y8 Efather was not hugging him with bare skin and had
+ Q: Q& f, M/ H# u, B( E( J4 |been using protective clothing. A repeat testosterone
2 x7 d% z. ^( T9 Utest was ordered, but the family did not go to the$ F- d7 o7 x* S" m) s. T
laboratory to obtain the test.& i- C+ h+ [3 ?6 g8 d5 H, w" t, p
Discussion, F. p( e" Y/ h; L0 C; E0 z; f
Precocious puberty in boys is defined as secondary
/ ~, X( Q+ O4 R% }! Q4 ?$ asexual development before 9 years of age.1,4
9 R1 \& j7 i0 U9 L7 HPrecocious puberty is termed as central (true) when
. `2 q* L9 D) N4 j0 M% n4 Xit is caused by the premature activation of hypo-
3 D8 A7 v& P2 s" l! a4 Othalamic pituitary gonadal axis. CPP is more com-
' a5 [2 _: M4 d' F0 b4 Cmon in girls than in boys.1,3 Most boys with CPP" D! ~' \6 b O3 G- i- W
may have a central nervous system lesion that is7 h1 p7 ^1 K1 N: v* V
responsible for the early activation of the hypothal-% s: L* F& ?, [( u% r9 u- K2 C: H5 x2 K
amic pituitary gonadal axis.1-3 Thus, greater empha-
: \$ }/ [; m. Z! i2 Osis has been given to neuroradiologic imaging in
5 w7 _) F" C# S; g7 k6 Gboys with precocious puberty. In addition to viril-/ U$ o3 ? x: h. [# {" [/ ~0 H6 @
ization, the clinical hallmark of CPP is the symmet-0 n, L9 v6 o5 b6 |) K+ C' _: f* ]
rical testicular growth secondary to stimulation by+ B' G) y/ n. W3 c, |
gonadotropins.1,3
2 ~' i1 A V, i5 RGonadotropin-independent peripheral preco-3 K9 c; y7 r4 Z( @1 k
cious puberty in boys also results from inappropriate- t7 S5 D" ]# {1 w: v$ G
androgenic stimulation from either endogenous or
, G z8 r R4 ]" [exogenous sources, nonpituitary gonadotropin stim-* v M! w: U; E/ e8 A- ]
ulation, and rare activating mutations.3 Virilizing
& M9 ~& c# u! Z0 hcongenital adrenal hyperplasia producing excessive
- K$ w' S( u2 @$ c1 Q# K J5 @adrenal androgens is a common cause of precocious# [( x0 x2 W9 ]' _+ @2 a: d
puberty in boys.3,4% b5 g% |; ^. K9 E, {
The most common form of congenital adrenal5 f0 R# k( W- {6 \5 b; a
hyperplasia is the 21-hydroxylase enzyme deficiency.9 j* ]6 ^1 h& O& F+ c% f
The 11-β hydroxylase deficiency may also result in4 T Y) @* M! }9 ]& x
excessive adrenal androgen production, and rarely,
/ c% O3 [! m6 ]2 Q7 Pan adrenal tumor may also cause adrenal androgen' ?" @5 W# z. @
excess.1,3
$ x7 j. k0 X! w X2 ~8 R, a4 B5 X) tat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
2 S, I. H& _9 S B" P& ]542 Clinical Pediatrics / Vol. 46, No. 6, July 20071 ?' \$ b- l* j4 @; I' d; c S
A unique entity of male-limited gonadotropin-/ q7 d, ]" X; L N4 b$ ?, S8 _ b* h# p
independent precocious puberty, which is also known
K/ M" n/ b5 M# m: Uas testotoxicosis, may cause precocious puberty at a( g1 d2 F( n; q& H7 x
very young age. The physical findings in these boys
! r- n4 f/ E/ `0 Uwith this disorder are full pubertal development,0 v7 I1 z3 w: b# v& U
including bilateral testicular growth, similar to boys
+ U2 o+ D8 O+ x2 l7 {5 X5 }2 P/ a' lwith CPP. The gonadotropin levels in this disorder( `$ [* F" j8 ~( h
are suppressed to prepubertal levels and do not show1 n2 {, W; g+ T1 m. k3 c
pubertal response of gonadotropin after gonadotropin-: a* _" X B& W0 \' ?* w
releasing hormone stimulation. This is a sex-linked, i/ u( x5 k5 B- V2 o; v* _6 w% B
autosomal dominant disorder that affects only8 n- Q( z2 m0 R* f
males; therefore, other male members of the family
F8 E/ k2 p. Y2 {8 L; i% p- k6 Umay have similar precocious puberty.3% N6 T3 c8 w" J0 E9 Z8 m
In our patient, physical examination was incon-
8 n$ V7 x4 v* Rsistent with true precocious puberty since his testi-' m8 C' Q' ^( s4 L9 a/ C& I- n7 c
cles were prepubertal in size. However, testotoxicosis
3 h V" h1 ^( k' `; n3 l$ |$ }! L9 Swas in the differential diagnosis because his father
/ E' m5 J3 o) i! g5 ~( Lstarted puberty somewhat early, and occasionally,
. ?. A$ v V/ ^6 Z! A6 ?4 vtesticular enlargement is not that evident in the3 v- e1 z# s T. U7 U* ]0 _
beginning of this process.1 In the absence of a neg-
/ w! y! v' l s- g( G$ Mative initial history of androgen exposure, our
; [ U" U, w1 @biggest concern was virilizing adrenal hyperplasia,; |: D! @# D5 n6 ~0 e8 h
either 21-hydroxylase deficiency or 11-β hydroxylase0 y" m I. Q5 N1 G3 a6 l; @# S2 y
deficiency. Those diagnoses were excluded by find-
" w3 C! U" f- n0 e7 l2 ving the normal level of adrenal steroids.
9 c4 |8 g3 O3 M% F: h% |7 RThe diagnosis of exogenous androgens was strongly
7 j: q9 c: [# U, x* ~& Ssuspected in a follow-up visit after 4 months because
: L: n% h0 y. E; `the physical examination revealed the complete disap-
. W) k: R8 s9 U3 ppearance of pubic hair, normal growth velocity, and
! U0 v& ^; V- I. }. g6 y1 Ndecreased erections. The father admitted using a testos-
0 `) r/ c+ y% i: r6 I- bterone gel, which he concealed at first visit. He was E3 t- _( o: D" Z8 V
using it rather frequently, twice a day. The Physicians’
\1 X# l: i0 }4 G7 SDesk Reference, or package insert of this product, gel or
4 h" n" c6 o: ]) @3 ]0 pcream, cautions about dermal testosterone transfer to+ U8 g0 r: T7 S6 r( n4 o2 b6 `, y
unprotected females through direct skin exposure." p, `7 I+ _$ H; t1 E3 i
Serum testosterone level was found to be 2 times the- \& m8 {) H1 c4 C$ G. z( {
baseline value in those females who were exposed to: Q+ f' w0 U5 D: I7 ?1 x
even 15 minutes of direct skin contact with their male
2 b6 L1 h2 ]; e+ h$ h# ]# ~partners.6 However, when a shirt covered the applica-( f5 M% H \, m* q) {* B
tion site, this testosterone transfer was prevented.0 P8 [1 b- E8 I- Y O2 i
Our patient’s testosterone level was 60 ng/mL,
% l3 p2 a. D: @which was clearly high. Some studies suggest that
% Q; _) R/ \' C# |dermal conversion of testosterone to dihydrotestos-% N7 |7 i0 }4 [0 @0 g& `
terone, which is a more potent metabolite, is more
1 H. m9 x1 [ G" J5 Qactive in young children exposed to testosterone4 E3 ^6 L. ^( A+ h
exogenously7; however, we did not measure a dihy-4 `' J" W1 C+ r8 F) e% i2 Q: {
drotestosterone level in our patient. In addition to
9 y; e) L% i# v, e# p) [' |virilization, exposure to exogenous testosterone in
$ p3 J+ w' }+ {, s& {children results in an increase in growth velocity and+ V. \ X# `& C: y+ S
advanced bone age, as seen in our patient.
; b/ n6 l& m r/ f6 Z3 NThe long-term effect of androgen exposure during9 d* u( b7 l" B# l! ?6 N0 a
early childhood on pubertal development and final* ]$ L2 `$ a' {+ H% s% Z- ]
adult height are not fully known and always remain0 E$ F9 n i% S$ }, s
a concern. Children treated with short-term testos-
, M$ w. W% {( V8 qterone injection or topical androgen may exhibit some
# P: P ~9 F% K4 z3 X# i2 \$ m+ Pacceleration of the skeletal maturation; however, after# a- U$ P2 r/ p2 H/ d
cessation of treatment, the rate of bone maturation5 t* s3 L' y( _2 ~) N! _8 @& K
decelerates and gradually returns to normal.8,9! [* N7 d! G; N/ ], E, E. T* P4 ?
There are conflicting reports and controversy
5 ]! a; |* K: C. T6 {9 fover the effect of early androgen exposure on adult* V2 a9 Z6 q& p9 H0 ^! A
penile length.10,11 Some reports suggest subnormal
* ]. J" O* K9 w" Xadult penile length, apparently because of downreg-+ x& l a" z/ \+ S
ulation of androgen receptor number.10,12 However,& G7 A' y4 ?2 [. G8 G; A
Sutherland et al13 did not find a correlation between
4 \1 S) W% h9 @- x' R9 l! ^childhood testosterone exposure and reduced adult/ o+ W, q5 ]1 T
penile length in clinical studies.
! {: n p6 m! I. m! [) `0 b) {Nonetheless, we do not believe our patient is
/ Z ~# ~9 d' E/ dgoing to experience any of the untoward effects from) v4 Y$ b6 }9 P' K/ w8 s3 R
testosterone exposure as mentioned earlier because( u" l; \6 ^$ v0 `# d2 Y
the exposure was not for a prolonged period of time.6 ~+ B! _4 ?; |" G
Although the bone age was advanced at the time of
0 B) Q5 A2 F/ B2 C7 s ddiagnosis, the child had a normal growth velocity at5 L, r7 \; M7 f9 N
the follow-up visit. It is hoped that his final adult
# {9 D3 u6 @- A }3 s# lheight will not be affected." b- X1 I2 f5 b
Although rarely reported, the widespread avail-, @& `; l! E7 F" S' M5 j# e
ability of androgen products in our society may4 E* G/ }1 a3 j9 c/ }' T V
indeed cause more virilization in male or female8 G- l* o& Q0 @: i: E6 s, j. T
children than one would realize. Exposure to andro-, ?% a% {9 q. _& G* J. g/ y- y( _
gen products must be considered and specific ques-
' l8 h) b, b% htioning about the use of a testosterone product or5 x5 P0 p; E) A& K4 ^: h6 z
gel should be asked of the family members during% o/ R& y* C/ |. C h' J8 }
the evaluation of any children who present with vir-
/ U4 Y! b: k5 G, x5 Z+ e/ Lilization or peripheral precocious puberty. The diag-/ c# I; a2 l0 H m: |& w
nosis can be established by just a few tests and by( e& l4 y* q1 t& f8 P# g
appropriate history. The inability to obtain such a' [0 A5 O+ K, j+ a) i- K' G
history, or failure to ask the specific questions, may- F! x* Y* s: m) b
result in extensive, unnecessary, and expensive
! E9 |+ q% ^; Iinvestigation. The primary care physician should be! D. f8 A! o: r2 w9 p+ m8 J
aware of this fact, because most of these children
! B B# T- u3 ?2 Lmay initially present in their practice. The Physicians’
; ]3 E* H8 f: b! B6 S3 yDesk Reference and package insert should also put a# T1 W5 _3 {- n0 v, q+ V" `4 E
warning about the virilizing effect on a male or
' `4 Y( g# u1 l9 q& V9 @" qfemale child who might come in contact with some-
" ^/ Z( S% U2 I5 [. zone using any of these products.
* Y. l% G, |' n& I; V/ q0 b! sReferences
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" x7 g% k2 x0 _- {, f2002: 565-628.
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exposure to testosterone. Pediatrics. 1999;104:e23.' z% A8 y2 ^2 _( r4 j: n" |/ a/ \
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3 \! d' C+ Q; Q4 f0 IStanford, CA: Stanford University Press; 1959.
! \0 s# X4 m% Y+ s6. Physicians’ Desk Reference. Androgel 1% testosterone,
4 \) g: C) I4 l, S. AUnimed Pharmaceutical Inc. Montvale, NJ: Medical
+ O6 O8 ~4 N* v4 A8 z4 rEconomics Company, Inc; 2004:3239-3241.; L S1 @6 q( w1 e
7. Klugo RC, Cerny JC. Response of micropenis to topical y2 b+ n" x0 |& J1 S
testosterone and gonadotropin. J Urol. 1978;119:# e0 g" P3 s& p$ X/ f+ T& d8 j
667-668.
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