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is a significant concern for physicians. Central4 @1 _3 G; {3 ?! P) N A( m) }
precocious puberty (CPP), which is mediated
1 ]' g8 H. V O, Dthrough the hypothalamic pituitary gonadal axis, has3 S0 A+ M w# K$ i& Q
a higher incidence of organic central nervous system
& d: m( K5 t' Clesions in boys.1,2 Virilization in boys, as manifested
l/ T# {; S7 c! l$ U/ D% pby enlargement of the penis, development of pubic. G1 f, X; d* g/ w
hair, and facial acne without enlargement of testi-
& i# E5 ?9 \# e+ Y& P& I l/ pcles, suggests peripheral or pseudopuberty.1-3 We
5 D2 U8 C0 a# i: Lreport a 16-month-old boy who presented with the, X' S# O+ O" Z$ K
enlargement of the phallus and pubic hair develop-& }5 k) s. \$ w( N/ h% L) D9 u
ment without testicular enlargement, which was due
4 H; e2 n- x: Z7 g! Pto the unintentional exposure to androgen gel used by: J8 C+ ^5 {& [* e2 \ p, N8 U
the father. The family initially concealed this infor-
4 }+ `& S' j: U" b% N- E/ Zmation, resulting in an extensive work-up for this# s7 U/ x1 k/ n, V) w( h
child. Given the widespread and easy availability of9 x5 f* f! ^& U0 r. U! A2 B: N
testosterone gel and cream, we believe this is proba-1 I8 E% D% n( Y" N, l' N4 G3 S
bly more common than the rare case report in the
* L' _2 l9 X# d, e4 g. wliterature.4
0 {3 D) S& n( |/ l U, IPatient Report1 O! u+ A9 S+ R% a5 b& f3 l C
A 16-month-old white child was referred to the S2 d Q( Z/ G# u
endocrine clinic by his pediatrician with the concern
& S: r7 a% h3 N) G8 N) ^of early sexual development. His mother noticed
3 B$ c- ]+ e+ L4 V. n+ `# d5 B0 T2 Glight colored pubic hair development when he was, Y1 V9 @6 Y4 R
From the 1Division of Pediatric Endocrinology, 2University of- g* w8 M) A, p
South Alabama Medical Center, Mobile, Alabama.
1 s2 r+ B# {1 mAddress correspondence to: Samar K. Bhowmick, MD, FACE,7 }5 ~1 ~, O- w- O
Professor of Pediatrics, University of South Alabama, College of
* R' W" J" R" I/ {2 a2 {' W0 E3 hMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
6 X) }, U% }* p9 B! `4 f" o* we-mail: [email protected].
! {+ f2 G5 l& mabout 6 to 7 months old, which progressively became
' \7 v8 I$ F* X' mdarker. She was also concerned about the enlarge-: S) j) {* g, A( Z1 ~
ment of his penis and frequent erections. The child% k3 `: q8 U4 T* \
was the product of a full-term normal delivery, with
- Z0 \. e% ~! k7 ~a birth weight of 7 lb 14 oz, and birth length of% f5 a9 v' `2 m; f3 v( N
20 inches. He was breast-fed throughout the first year- }& w, R% Q! d: b5 |
of life and was still receiving breast milk along with$ J/ ~; [; H* ~; y
solid food. He had no hospitalizations or surgery,
! [0 ]* z. l7 B/ B6 N) @$ L: E" cand his psychosocial and psychomotor development# ]1 F d; Q( n' ~, G2 a
was age appropriate.0 [0 l3 |. v6 Y6 X, o1 v
The family history was remarkable for the father,
0 d$ f; j7 f' N" [6 h R7 }* j R+ C; \who was diagnosed with hypothyroidism at age 16,
* {4 \* L' C+ j. _8 V! Q+ ~which was treated with thyroxine. The father’s+ b. J! T/ G! ]! \) k% C
height was 6 feet, and he went through a somewhat
* b$ w- l9 t! ?: n" l$ N8 `early puberty and had stopped growing by age 14.
9 x9 y6 ]6 A% B, N( Z- `The father denied taking any other medication. The& K6 t4 G# P! j" u6 y- Y" r: q
child’s mother was in good health. Her menarche8 C! `& `$ l u( e- H v* n
was at 11 years of age, and her height was at 5 feet& M2 M7 ]# S/ g0 o& \& i
5 inches. There was no other family history of pre-
- s" N# z7 F/ l' j7 Q* gcocious sexual development in the first-degree rela-; Q& A _; B. |1 \& N: O
tives. There were no siblings.
: F; b8 u$ c. sPhysical Examination
5 @- @" ? F7 |( I2 Z/ }The physical examination revealed a very active,
3 ?9 {% k' H: x- S. }* v( tplayful, and healthy boy. The vital signs documented
1 |3 N8 a' k3 V5 U' V3 va blood pressure of 85/50 mm Hg, his length was9 O* V' J* l- c. I
90 cm (>97th percentile), and his weight was 14.4 kg- N0 l" j% S# p" i- X5 E* g
(also >97th percentile). The observed yearly growth0 g. Q, K6 A8 N
velocity was 30 cm (12 inches). The examination of
$ u; A; e X6 X3 ~0 L# g1 @the neck revealed no thyroid enlargement.
3 Y# `* i" P$ Y; m$ C, fThe genitourinary examination was remarkable for
. k& n9 f' g, Y5 R* B* u$ ]' |enlargement of the penis, with a stretched length of
( J1 t6 O& I) o4 u, J2 ^8 cm and a width of 2 cm. The glans penis was very well! L: e1 p8 t/ ^( B2 G" e
developed. The pubic hair was Tanner II, mostly around
% h2 `* N) M& p/ N+ l# K540
, O. f$ d' x6 w* ^at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
, Q B% b# ~) g3 K; _0 w- Z2 cthe base of the phallus and was dark and curled. The0 T4 ?7 N. D' c9 y% ?* w. I
testicular volume was prepubertal at 2 mL each.2 C+ W* h' c& p4 a2 e6 N+ p9 g
The skin was moist and smooth and somewhat
/ U* U+ @' \+ F: d. @5 u X1 K: y0 Koily. No axillary hair was noted. There were no! K) n( w' g* b; Q: U7 Q9 L' l
abnormal skin pigmentations or café-au-lait spots.
' M8 {7 G \: C% k' g7 RNeurologic evaluation showed deep tendon reflex 2+
- H: T0 @7 V2 c8 V6 E9 Kbilateral and symmetrical. There was no suggestion
0 b8 J( O0 L' g; _of papilledema.
( s2 J9 H7 T; A) v; f/ CLaboratory Evaluation* ]" p$ b$ ?; ^
The bone age was consistent with 28 months by
: Z2 T/ z& R! w D0 Q! fusing the standard of Greulich and Pyle at a chrono-
5 b3 G. ?" I$ s( Y9 C7 } Y0 o- clogic age of 16 months (advanced).5 Chromosomal4 r H! j) k* Y) p- ~: d7 d
karyotype was 46XY. The thyroid function test
* U1 g$ B8 K! O) P- bshowed a free T4 of 1.69 ng/dL, and thyroid stimu-
6 D% ~, z1 {& V! F" L [9 R; X! p3 Glating hormone level was 1.3 µIU/mL (both normal).: B" E4 m% d& ~% o& Z" O6 H8 [
The concentrations of serum electrolytes, blood
$ \5 d6 h% T+ D3 E. `* F, _) T* jurea nitrogen, creatinine, and calcium all were, P4 b* N. }6 Z" M: ~
within normal range for his age. The concentration
5 v- \+ | _) O" m$ [% oof serum 17-hydroxyprogesterone was 16 ng/dL6 D m! K' F: e( z' ?
(normal, 3 to 90 ng/dL), androstenedione was 20. Q- e8 x% ^$ |& f
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-& Y0 n( I* q" X, v( P
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
, }. o4 a/ j. q; n& u; fdesoxycorticosterone was 4.3 ng/dL (normal, 7 to
% ?7 _2 \9 {# Q6 i& T- L/ u. @49ng/dL), 11-desoxycortisol (specific compound S)4 w# e6 n& b8 `( g* k. B, o
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
+ D* n1 |# t. d, e+ r* Q4 xtisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
0 T6 J1 F4 o7 w* v4 Y' utestosterone was 60 ng/dL (normal <3 to 10 ng/dL),
5 B! u' l. ?* O7 kand β-human chorionic gonadotropin was less than
7 k* n$ w W5 t* U1 \5 mIU/mL (normal <5 mIU/mL). Serum follicular
5 w7 x: p! v" v8 B7 l' c% astimulating hormone and leuteinizing hormone
& b" v( D# r* w6 i' K5 jconcentrations were less than 0.05 mIU/mL
# W2 x5 q9 N P' @(prepubertal).
( ~. d* G% J: t& I/ u4 tThe parents were notified about the laboratory
, o f/ p3 R9 i$ w4 t* G7 D+ [; C; wresults and were informed that all of the tests were
% {) m3 r- ?+ k4 Z) [normal except the testosterone level was high. The
+ W6 v; k* v8 l1 T8 i6 ~follow-up visit was arranged within a few weeks to
2 v, }; E9 K# S6 z+ c1 |6 H& Dobtain testicular and abdominal sonograms; how-$ ?7 {# m" T, p+ @
ever, the family did not return for 4 months.9 `9 t) ]- x# Y; d! F: [
Physical examination at this time revealed that the
9 G( y& d1 D9 y; vchild had grown 2.5 cm in 4 months and had gained& k# h* Y0 z* Q6 Y
2 kg of weight. Physical examination remained1 ^4 d2 |* f( q9 [- d
unchanged. Surprisingly, the pubic hair almost com-
# `0 J6 O2 }$ p* L1 `# s upletely disappeared except for a few vellous hairs at/ j6 T* h9 q# ^4 }# K- ^
the base of the phallus. Testicular volume was still 2- m& F: D8 S4 x( X# I# Z; N
mL, and the size of the penis remained unchanged.
0 N9 G( L3 |0 u9 e% O: e1 c/ I# p, OThe mother also said that the boy was no longer hav-
& G7 u( A6 k. {/ Qing frequent erections. b8 m* G! Y/ H1 g1 e- D6 q
Both parents were again questioned about use of
; W0 t( [' A2 j! E p' T3 v2 \% Qany ointment/creams that they may have applied to) Y o( S7 o% b3 H& `. S
the child’s skin. This time the father admitted the
; c6 V; U, E; ?0 G; p% L" d2 ETopical Testosterone Exposure / Bhowmick et al 541
# c: ?. L3 C Zuse of testosterone gel twice daily that he was apply-
$ e) S7 j+ r- Aing over his own shoulders, chest, and back area for/ Z& t) j3 F9 {: ]0 h: Z
a year. The father also revealed he was embarrassed' A! I7 M. r- o& B% m( V) N2 Q
to disclose that he was using a testosterone gel pre-# A1 _, U: b; _+ C
scribed by his family physician for decreased libido3 R3 h' T# Q8 y" {
secondary to depression.4 p. E$ @) N- O5 a% R
The child slept in the same bed with parents.- R x: ?( a5 t
The father would hug the baby and hold him on his
- `) j2 E$ g) Z7 Mchest for a considerable period of time, causing sig-
0 [* ^# t7 J; q2 T H0 |nificant bare skin contact between baby and father.1 O+ Z: j# X& u
The father also admitted that after the phone call,
# {! g8 n, L6 d( v4 [when he learned the testosterone level in the baby
% w' m/ k x6 _7 r6 \1 Bwas high, he then read the product information
# n! d- W2 }* o: O$ E+ N/ ?packet and concluded that it was most likely the rea-9 a# ^8 M7 B( ~" ]
son for the child’s virilization. At that time, they
; G+ W( M8 y$ v* u0 t( `decided to put the baby in a separate bed, and the6 x6 ?; c* N, Q
father was not hugging him with bare skin and had( A. g2 `1 f7 F
been using protective clothing. A repeat testosterone$ j. ?' ]' n' K4 P
test was ordered, but the family did not go to the) P5 g( `: a* j$ d, C5 W0 l7 P
laboratory to obtain the test.! l9 q2 q5 ~% h; ?5 L* q! ^9 P
Discussion
" l" P+ e- ~" C4 r' \* ]Precocious puberty in boys is defined as secondary9 O. Y I- Y' l
sexual development before 9 years of age.1,4
2 F/ K; J" X# U' n& b+ c9 nPrecocious puberty is termed as central (true) when# `* p, T0 _- P( F$ K' G8 \8 Y- C! p
it is caused by the premature activation of hypo-
3 Z, \1 N9 y! b: A2 a; Tthalamic pituitary gonadal axis. CPP is more com-- ]( A y% K6 Y" c
mon in girls than in boys.1,3 Most boys with CPP- K- Y; x* y% e
may have a central nervous system lesion that is
8 u' r$ |+ m1 tresponsible for the early activation of the hypothal-
' k+ z5 p# w( [! ^0 Z# v) Namic pituitary gonadal axis.1-3 Thus, greater empha-
0 a) G. ~; G6 lsis has been given to neuroradiologic imaging in
4 y9 P$ b+ y2 \2 P1 Nboys with precocious puberty. In addition to viril-4 W" v* q8 m% h: {
ization, the clinical hallmark of CPP is the symmet-+ O1 u7 U/ v. k3 Q. m3 D' _2 \( g/ u/ K' ?
rical testicular growth secondary to stimulation by- X+ N2 I2 ]6 M' [0 [' l2 _( N6 K
gonadotropins.1,3
2 q+ r/ g8 }6 d# n, B3 f8 W* FGonadotropin-independent peripheral preco-# _, | D, @+ ?0 b
cious puberty in boys also results from inappropriate3 c1 {- q* B7 ?+ S! M
androgenic stimulation from either endogenous or, l- g- {! ?, v! V: I
exogenous sources, nonpituitary gonadotropin stim-" t- [$ N& u3 b" J/ C
ulation, and rare activating mutations.3 Virilizing5 l" q. x2 u% v3 i4 }/ \8 B6 {4 [
congenital adrenal hyperplasia producing excessive
5 Y. N" {( \0 d4 d& c# cadrenal androgens is a common cause of precocious a* `/ N1 d6 r: u
puberty in boys.3,4 T) b( V! g# X7 J3 @: L- T
The most common form of congenital adrenal
) O6 s3 I# q) l- b) ], h* Qhyperplasia is the 21-hydroxylase enzyme deficiency.
+ b* C, P+ u3 E/ w h1 m& \0 pThe 11-β hydroxylase deficiency may also result in/ ~% q. V( r6 k$ l# b1 u Y
excessive adrenal androgen production, and rarely,
/ U* w/ Y4 j; Y$ y5 Jan adrenal tumor may also cause adrenal androgen
' T Q+ V" ]2 F/ ~2 m. J" Uexcess.1,37 T3 R, ?; [5 G7 o6 t2 c* \
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
$ I2 }/ i" l3 Y% K9 S# A542 Clinical Pediatrics / Vol. 46, No. 6, July 20070 c( O8 s. s' @1 V
A unique entity of male-limited gonadotropin-5 K% y. Y! T6 o7 i: R, k/ ^
independent precocious puberty, which is also known6 t) \% W3 N! `2 Z
as testotoxicosis, may cause precocious puberty at a) F( ~. U3 k& x$ C
very young age. The physical findings in these boys
. u8 Z7 r* S& h- ?with this disorder are full pubertal development,
& | |" n- S+ ], q+ oincluding bilateral testicular growth, similar to boys' O/ ^6 K) u" U( z( C7 b- @
with CPP. The gonadotropin levels in this disorder
4 S# G4 n0 S: i h3 N1 care suppressed to prepubertal levels and do not show0 V: y# ~: }" |& K9 G9 k# C1 A
pubertal response of gonadotropin after gonadotropin-
9 A' O @1 h2 W$ c/ U/ N3 `releasing hormone stimulation. This is a sex-linked2 t: D7 [4 t5 ^9 H
autosomal dominant disorder that affects only
g/ @; c [. ^, O1 Pmales; therefore, other male members of the family8 m/ t' B7 L6 Q8 L
may have similar precocious puberty.3, V& |, ^; I) Q0 E: V
In our patient, physical examination was incon-
' ]1 P" ]) i. M, q, @) z7 \ Z' wsistent with true precocious puberty since his testi-
+ f+ ^. q2 S; ]4 e! @7 h: I# ecles were prepubertal in size. However, testotoxicosis
$ L9 I6 n- C- Swas in the differential diagnosis because his father. n5 ^6 t$ F( ?' V% J" ~
started puberty somewhat early, and occasionally,7 ~+ Y# d! C* H. J2 [# `
testicular enlargement is not that evident in the
1 C; _7 C. y$ p, \, m @4 Fbeginning of this process.1 In the absence of a neg-
( X5 s$ D1 v2 i5 j/ D- i+ zative initial history of androgen exposure, our* n* ^7 U; [* J. x. ?
biggest concern was virilizing adrenal hyperplasia,4 S3 k0 O+ ?9 i* W
either 21-hydroxylase deficiency or 11-β hydroxylase
) _7 b/ D9 m' R8 t' ?( n) T9 }deficiency. Those diagnoses were excluded by find-5 P, M! \: d8 m& O- W$ e. T) x
ing the normal level of adrenal steroids.
; g" ^3 ?2 p2 ^# }2 |# ~ O# g. TThe diagnosis of exogenous androgens was strongly5 A% R$ [3 G1 l# E! t
suspected in a follow-up visit after 4 months because$ s) S( }. |# b8 S& K
the physical examination revealed the complete disap-) J, _( q- A! A) y
pearance of pubic hair, normal growth velocity, and
4 k) _$ n8 x [/ \3 gdecreased erections. The father admitted using a testos-
: N$ c2 W/ r' _- \4 T# S% P# ?5 lterone gel, which he concealed at first visit. He was
4 o8 _2 r k7 a8 U6 Pusing it rather frequently, twice a day. The Physicians’
" I+ p$ {) J, o7 oDesk Reference, or package insert of this product, gel or& Q; P# g- y' _7 K
cream, cautions about dermal testosterone transfer to/ w5 a1 f# A2 c: e/ ?
unprotected females through direct skin exposure.
5 `+ r1 n/ l* ?& a+ l( P$ u' p& ZSerum testosterone level was found to be 2 times the" o; I1 D6 T8 l
baseline value in those females who were exposed to
, a& E6 G! m+ U/ ]& o5 {) y4 oeven 15 minutes of direct skin contact with their male
, ~, |# `& U/ w' g& L1 n. @partners.6 However, when a shirt covered the applica-
3 M3 n P3 N _tion site, this testosterone transfer was prevented.
- I: {4 A" } `" }% |Our patient’s testosterone level was 60 ng/mL,
- m+ f$ u% y. h: J# b* iwhich was clearly high. Some studies suggest that
# P: f. y2 L6 B% j( {# z+ p7 J ndermal conversion of testosterone to dihydrotestos-% [: T, p0 H9 x: V& ^+ c3 m
terone, which is a more potent metabolite, is more s, G& z5 F% N' w, j
active in young children exposed to testosterone1 Z# S; V p$ P5 ~0 }3 u7 f
exogenously7; however, we did not measure a dihy-
. ^, ?6 E. g% V, odrotestosterone level in our patient. In addition to
8 r4 O: I( f' v: ~6 [4 Dvirilization, exposure to exogenous testosterone in
7 a* r! o9 k5 \7 Q! e/ hchildren results in an increase in growth velocity and
4 ]4 w* ~! B, l: o; E" A/ l; _advanced bone age, as seen in our patient." _3 o* n$ W; G* G- M' W3 G- k& ~
The long-term effect of androgen exposure during! {5 B, X$ e& B% j
early childhood on pubertal development and final
y. N! _8 y. `) {adult height are not fully known and always remain
D( C" w% Q; z4 `a concern. Children treated with short-term testos-# _0 u3 J/ @$ h+ h2 T: l- ]( k
terone injection or topical androgen may exhibit some
5 L* T" f2 | S: `7 @7 w: r F. {acceleration of the skeletal maturation; however, after6 M: {0 O) {- ~( Z8 Y* U% t
cessation of treatment, the rate of bone maturation
- ?7 @' K% w, r4 c4 Z, q( bdecelerates and gradually returns to normal.8,9
9 g2 R* R2 ]& F# MThere are conflicting reports and controversy. b2 z; M# x7 S5 p
over the effect of early androgen exposure on adult
( a2 X. I& V0 Q4 s: N. d; K+ ?9 _. Vpenile length.10,11 Some reports suggest subnormal: N) _& z# d. g; b
adult penile length, apparently because of downreg-" C4 s1 |5 U. d" {* W; X% C6 }
ulation of androgen receptor number.10,12 However,
# a4 S8 `! ?( J) b, JSutherland et al13 did not find a correlation between0 `, d7 k) E6 l+ E. U6 y3 S
childhood testosterone exposure and reduced adult
' i/ b6 { k. z* s9 A5 b+ i$ Kpenile length in clinical studies. X$ n9 i( [8 N1 K6 i% p8 b% e- g
Nonetheless, we do not believe our patient is
1 g7 i' L5 E# x+ f$ n( wgoing to experience any of the untoward effects from
2 }7 H; v; u0 R3 q9 @" _testosterone exposure as mentioned earlier because7 N) \$ k+ T3 _7 |7 Q
the exposure was not for a prolonged period of time.
2 w; U* U/ _0 jAlthough the bone age was advanced at the time of& N- `6 K# s8 l J1 _$ R7 ?
diagnosis, the child had a normal growth velocity at
9 _/ R: x) D1 H: A t% S0 hthe follow-up visit. It is hoped that his final adult; R/ R# P- f& }) U; k9 z
height will not be affected.
1 D1 C3 ?0 a- Q; ~Although rarely reported, the widespread avail-
/ `+ j; _8 k7 |0 l3 }ability of androgen products in our society may
G9 b' i7 f7 A" [indeed cause more virilization in male or female
# a2 k& g: _3 |) }6 |4 Vchildren than one would realize. Exposure to andro-! Z! \/ B6 z" B+ r# p1 G8 l( M
gen products must be considered and specific ques-
. I. X* W2 L) A$ s* Vtioning about the use of a testosterone product or9 j e+ e/ p# d0 L
gel should be asked of the family members during
( p7 W6 @! X% z6 Q7 v5 tthe evaluation of any children who present with vir-
9 x6 Q C! E" Q! }& J) Gilization or peripheral precocious puberty. The diag-/ c! }1 b- h0 h' y
nosis can be established by just a few tests and by
. R5 U4 v1 t/ f. e9 S9 Q$ Happropriate history. The inability to obtain such a
4 v* h. G+ g$ B4 v/ ahistory, or failure to ask the specific questions, may
) Q7 u6 A }& ` q! t' g3 Kresult in extensive, unnecessary, and expensive
# B# V/ i m. p0 rinvestigation. The primary care physician should be
( `8 N9 i$ T5 w4 `2 z) Aaware of this fact, because most of these children3 a$ J1 v0 P0 N J) f4 \
may initially present in their practice. The Physicians’
( n% y& g. K& WDesk Reference and package insert should also put a! ^+ T' _9 s4 h. g7 o/ }; j" `
warning about the virilizing effect on a male or/ N" I, k0 f$ E2 c
female child who might come in contact with some-9 Q+ G: D- W5 u& R3 q6 O) k& w
one using any of these products.- E p6 v/ j- v A/ f
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- B) ^; l2 l3 C* ]& K, h2002: 565-628.; W& Y$ s; t+ q' D! |' P
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0 X# J4 Y7 X, B/ M ~0 p" ^9 I# E# Zexposure to testosterone. Pediatrics. 1999;104:e23.2 F+ b9 C. B6 P
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5 d' H: \& T. S7 X5 \! hSkeletal Development of the Hand and Wrist. 2nd ed.& B3 {3 \! U6 ]6 K
Stanford, CA: Stanford University Press; 1959.
) F3 a8 z0 g) Z6. Physicians’ Desk Reference. Androgel 1% testosterone,
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