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is a significant concern for physicians. Central
2 C I' o3 \% A1 {' H" [/ Uprecocious puberty (CPP), which is mediated
1 Z6 a% a5 ^) h6 `* t4 ?through the hypothalamic pituitary gonadal axis, has
H3 w/ b5 [9 fa higher incidence of organic central nervous system
' U. P- V7 {) C9 hlesions in boys.1,2 Virilization in boys, as manifested
+ G+ \2 |( t, I; L# n" a" J+ ^4 T6 gby enlargement of the penis, development of pubic o S4 }; @1 z. K* P
hair, and facial acne without enlargement of testi-
+ |) ~7 v) w- vcles, suggests peripheral or pseudopuberty.1-3 We9 h4 z# ~# \: C$ l# n
report a 16-month-old boy who presented with the( C: d$ E- J1 b! S( o& m
enlargement of the phallus and pubic hair develop-0 o0 _# n2 v! a; `- E Q2 j
ment without testicular enlargement, which was due9 d0 Z. z" t, ] R. N& ]7 a5 N& u
to the unintentional exposure to androgen gel used by
3 a- o6 j4 ^& u/ A- Ithe father. The family initially concealed this infor-
( _/ K5 d% s" ^mation, resulting in an extensive work-up for this
! p5 }" H1 \ b& dchild. Given the widespread and easy availability of6 x8 c4 ]' A. V) O+ u% M, {
testosterone gel and cream, we believe this is proba-5 o! |- y1 a1 j0 y' K
bly more common than the rare case report in the* d- s2 d$ E* |" W; r
literature.4
" O% @5 R' J7 x$ A- GPatient Report0 v) S: S2 w7 V5 v( Q3 y
A 16-month-old white child was referred to the
1 N4 E8 @7 ?0 P$ Wendocrine clinic by his pediatrician with the concern
" j0 S; }, j, Fof early sexual development. His mother noticed& w: Y" h. T, r+ \8 h' g
light colored pubic hair development when he was4 X9 f& l+ [+ c/ q* K, W8 v* p: m" d
From the 1Division of Pediatric Endocrinology, 2University of
3 v- ?: t+ a; U0 H9 }% u9 P3 o- s& CSouth Alabama Medical Center, Mobile, Alabama.! [, r7 j5 u5 N4 }( x6 ?
Address correspondence to: Samar K. Bhowmick, MD, FACE,9 Z( g( I+ J' K; _6 O
Professor of Pediatrics, University of South Alabama, College of
, D. |! l; n) s. ~1 sMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;3 D Q* Z: H. b) A2 ^0 Z6 O3 f% O
e-mail: [email protected].
6 d- W, V( l' V, F: \about 6 to 7 months old, which progressively became# y0 I! S( H) w, [- _
darker. She was also concerned about the enlarge-' T% z, x, o3 H, t4 r" a& I
ment of his penis and frequent erections. The child
! I3 }! e) N7 E; A! P/ z7 e2 Cwas the product of a full-term normal delivery, with/ U" v5 D, ]0 V
a birth weight of 7 lb 14 oz, and birth length of" X2 p2 q( G! r; t" w
20 inches. He was breast-fed throughout the first year
B" p7 e( a4 l1 J/ v5 s% }of life and was still receiving breast milk along with b9 C. n0 `4 ~, k; L$ q, n7 t
solid food. He had no hospitalizations or surgery,. T7 ]# v- e9 }1 a6 a) ?2 o5 e
and his psychosocial and psychomotor development
M6 A# F3 C; }6 d3 Q- \8 E* X7 }, @was age appropriate.
" n! }; h/ M0 n X5 _6 z& ^: rThe family history was remarkable for the father,( J9 a6 L* e6 ]- c; ~" x, {
who was diagnosed with hypothyroidism at age 16,
6 `; h2 w/ U' Z+ L6 X) dwhich was treated with thyroxine. The father’s
0 m1 a' G% c0 K) K( s/ _* T! hheight was 6 feet, and he went through a somewhat
$ n* G H* Q! s0 vearly puberty and had stopped growing by age 14.
# j& g8 l* c0 J9 M' a3 eThe father denied taking any other medication. The
. L# E4 T$ l2 Dchild’s mother was in good health. Her menarche
' g) T' j% e& P/ X( ~2 ?' R( Nwas at 11 years of age, and her height was at 5 feet3 l/ H# G; Y( f+ c0 e4 j, o
5 inches. There was no other family history of pre-5 y% d7 V/ h* [9 C+ ~) u6 v7 _! p
cocious sexual development in the first-degree rela-
; o0 _5 z H1 T m. x; ^/ Dtives. There were no siblings.5 J8 f$ m3 q/ g% t6 o
Physical Examination* R1 [* {) f) R% H! }) ]! S0 d
The physical examination revealed a very active,2 F$ ^4 o X% ]& Q' B; r
playful, and healthy boy. The vital signs documented+ j# K) H+ Q3 ~4 i0 b
a blood pressure of 85/50 mm Hg, his length was
7 V7 F3 `" V+ s. i90 cm (>97th percentile), and his weight was 14.4 kg
( L6 {4 R2 Z5 \' U% `5 k" A0 `* g' P& X(also >97th percentile). The observed yearly growth' `1 }4 `* {0 D8 f8 B. [0 t
velocity was 30 cm (12 inches). The examination of
% z; b% D2 g- g5 Z) S3 z% xthe neck revealed no thyroid enlargement.8 p: b% b4 W e1 w# q3 z
The genitourinary examination was remarkable for8 N7 p' h C+ g* ?
enlargement of the penis, with a stretched length of
1 T# v& J) o/ ^7 d( d8 cm and a width of 2 cm. The glans penis was very well. A; I! @6 G3 ~% T
developed. The pubic hair was Tanner II, mostly around- E Y; @" f3 c4 H0 r. n
540
8 [ \* X+ j( k" j" _9 x" tat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from/ o# Z8 g( r+ {5 o6 }$ H3 ]9 ~
the base of the phallus and was dark and curled. The
! M+ @+ L8 z% A2 Xtesticular volume was prepubertal at 2 mL each.
0 d, r9 N* F+ j/ f' m6 dThe skin was moist and smooth and somewhat
5 l4 A1 g9 r% _. R( zoily. No axillary hair was noted. There were no) E3 r3 H6 m% ]5 G# K" I- |
abnormal skin pigmentations or café-au-lait spots.
3 d9 k' }7 m- V5 @/ hNeurologic evaluation showed deep tendon reflex 2+( W/ w* Q6 _5 P5 N7 E
bilateral and symmetrical. There was no suggestion
6 |* l% `$ L. T. [; z2 D6 Rof papilledema.
! V3 G7 Y" D/ E4 eLaboratory Evaluation. }& A0 T) ^8 _* Y/ j) U% Y" i
The bone age was consistent with 28 months by
$ V+ W5 y S3 V8 busing the standard of Greulich and Pyle at a chrono-" \& S+ b' M/ f/ @
logic age of 16 months (advanced).5 Chromosomal5 m8 y. _# A6 O' `) e
karyotype was 46XY. The thyroid function test) P/ V i ]' x+ i7 }
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
, T4 m, t$ U% } olating hormone level was 1.3 µIU/mL (both normal).
t/ i7 k& r3 U3 P8 f% G. ~3 HThe concentrations of serum electrolytes, blood
; Q! \/ j+ I, `5 @9 durea nitrogen, creatinine, and calcium all were
1 Z7 S8 W$ n$ i4 u: d/ e9 Twithin normal range for his age. The concentration
* |. u8 x% {# g, b* yof serum 17-hydroxyprogesterone was 16 ng/dL
, `" k/ D3 v e( u(normal, 3 to 90 ng/dL), androstenedione was 20! U! W: l, N! Q1 N2 d- P0 ^
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-1 X' }, Q) K; d
terone was 38 ng/dL (normal, 50 to 760 ng/dL),1 e* p; {) s/ c% p; y
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
6 m8 t* p& l+ F1 a) Y49ng/dL), 11-desoxycortisol (specific compound S)
% u- l1 w: C9 S! P( h0 l, dwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-$ ]0 f1 l9 ]. `- V
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total* }- M" }5 a, N" C `, U" ^
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),6 A8 J. G! y2 _! M4 t# b' c
and β-human chorionic gonadotropin was less than
9 y6 o! a6 K S' |3 S% D; k3 W- l5 mIU/mL (normal <5 mIU/mL). Serum follicular
# d+ I$ h; ~8 K8 ?stimulating hormone and leuteinizing hormone/ D0 c6 m: Q& u1 C: L# v! g8 \$ a' t
concentrations were less than 0.05 mIU/mL
2 J5 X/ [. d+ h7 z$ }7 g4 V(prepubertal).
8 M* W' \4 L( v% o2 d# \, N; vThe parents were notified about the laboratory
! v4 `+ o |, `* ]2 @results and were informed that all of the tests were
" D9 f! C4 d& j# o+ r) U! q4 s: ^normal except the testosterone level was high. The
1 B) U) Y5 |; |" E$ [follow-up visit was arranged within a few weeks to& q0 d% n! O9 Z1 r& s9 O
obtain testicular and abdominal sonograms; how-; T' ~0 r' Y& a$ \% h
ever, the family did not return for 4 months.
5 }9 w. V4 j& Y- W% ]Physical examination at this time revealed that the* ?, c% m2 u$ z# F5 B1 Q
child had grown 2.5 cm in 4 months and had gained: U5 Q: @& \ P2 k
2 kg of weight. Physical examination remained9 U; G, H- x6 |9 g- Q
unchanged. Surprisingly, the pubic hair almost com-0 O K# j; L$ [! N( k
pletely disappeared except for a few vellous hairs at( p2 Z& z) k5 a- t+ ?
the base of the phallus. Testicular volume was still 2
, `6 G: _ r+ ?mL, and the size of the penis remained unchanged./ U, S- T- c- b+ q0 g0 _
The mother also said that the boy was no longer hav-
$ ] S" X# K5 q' ~( z1 Qing frequent erections.1 {# k6 D$ I) @. u1 T
Both parents were again questioned about use of4 F9 }6 \, e: W- t g- ~6 c
any ointment/creams that they may have applied to6 n7 J5 l% f9 h. p: K2 V* e, J$ B
the child’s skin. This time the father admitted the9 ~. Q' R3 U& @- y7 `7 N
Topical Testosterone Exposure / Bhowmick et al 541
9 j! ]+ ]6 o9 h& uuse of testosterone gel twice daily that he was apply-
+ n5 ?: p* ] @& }( @8 T) Ming over his own shoulders, chest, and back area for7 N9 Y0 Q+ r" h
a year. The father also revealed he was embarrassed
0 u. F; Q$ P! T: hto disclose that he was using a testosterone gel pre-
9 m. G/ T- P$ ^; vscribed by his family physician for decreased libido
( u1 @$ F/ O) X( ^secondary to depression.
- E, `5 s# M5 u1 I8 s; V EThe child slept in the same bed with parents.) O; A6 Y) P( {; o
The father would hug the baby and hold him on his5 T, m q# ]# {! H+ O
chest for a considerable period of time, causing sig-& x3 u2 |! l" b4 P" e" B
nificant bare skin contact between baby and father.
( Z9 `; k. o* d9 S4 u0 ?The father also admitted that after the phone call,- e$ p/ E0 Y- S( o: k
when he learned the testosterone level in the baby
) e) O* f* G2 P5 B9 ^was high, he then read the product information
& C0 A) M; A3 D: P. cpacket and concluded that it was most likely the rea-) j1 O9 T2 _4 N/ n
son for the child’s virilization. At that time, they0 _% p! { G2 o0 R0 P
decided to put the baby in a separate bed, and the
7 M: B# z- S5 ^6 p+ m" S0 i4 U% Dfather was not hugging him with bare skin and had
k% E7 t5 O# lbeen using protective clothing. A repeat testosterone$ a: a; o4 e: W: q% ]" c
test was ordered, but the family did not go to the6 Z8 i" O# {- Y( \. h+ R! k
laboratory to obtain the test.+ _7 n5 _3 X/ q1 q7 h$ v
Discussion
& u$ L3 P9 A3 @: w/ k$ O# OPrecocious puberty in boys is defined as secondary S. h5 J" ?/ C) x, m- x
sexual development before 9 years of age.1,4
# M, r0 t% r+ ^3 g3 U, ~Precocious puberty is termed as central (true) when
) y# e% U9 h7 ^% O ]it is caused by the premature activation of hypo-: Y8 A# j, w9 N% V* P( d
thalamic pituitary gonadal axis. CPP is more com-
+ t3 L5 M( W) C2 G8 a% cmon in girls than in boys.1,3 Most boys with CPP
# r8 m0 D, Q7 {/ X+ `: nmay have a central nervous system lesion that is
( ?. d w! g1 p5 _2 ~0 P0 _3 Xresponsible for the early activation of the hypothal-
! d& S6 H, m1 u7 ]' R6 \2 v8 jamic pituitary gonadal axis.1-3 Thus, greater empha-6 f/ Q. C* k6 f7 }( \7 E }, A: g
sis has been given to neuroradiologic imaging in
2 X0 M2 I3 B4 {. Sboys with precocious puberty. In addition to viril-2 _" f5 Q% w5 ?& f# S7 M, N
ization, the clinical hallmark of CPP is the symmet-
0 o; Z# H$ Y) M/ i- [& T8 zrical testicular growth secondary to stimulation by$ Y% {2 X4 I/ C p3 Z
gonadotropins.1,3' ~. y4 ]4 t$ S9 H
Gonadotropin-independent peripheral preco-
3 p e3 |0 |) B" b3 ?! Icious puberty in boys also results from inappropriate" x; p4 k8 K9 B5 h! x1 [+ Z+ z
androgenic stimulation from either endogenous or
: D( E u( z# N8 cexogenous sources, nonpituitary gonadotropin stim-
% ?. t- x1 j2 R% B' a2 Q- c/ Yulation, and rare activating mutations.3 Virilizing, G1 Y% o' t* k0 j% Y" X! B% N
congenital adrenal hyperplasia producing excessive
7 j4 F% s8 A, Q2 J# y A. eadrenal androgens is a common cause of precocious$ n1 i ~ Q; o @( I
puberty in boys.3,4
+ }4 n& p3 E7 a( h3 N) V7 UThe most common form of congenital adrenal0 g4 G0 r% z0 E. ]8 Q
hyperplasia is the 21-hydroxylase enzyme deficiency., y( f4 f6 W( V. T1 X
The 11-β hydroxylase deficiency may also result in
- ~# c6 w2 n0 a0 ^$ V6 nexcessive adrenal androgen production, and rarely,
' O5 N3 A# [3 d# [# B9 C7 man adrenal tumor may also cause adrenal androgen
2 M; h" g' K6 Uexcess.1,3; d0 w! d$ J+ v5 S. x4 Y" V2 s
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
& U; ~) i3 t! f% @6 E) _- n. V542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
: x5 a. t+ |+ _; xA unique entity of male-limited gonadotropin-
0 ]9 F' M) e2 k% F# N9 uindependent precocious puberty, which is also known
( e) E9 H' ~! @4 V, z3 T# Ias testotoxicosis, may cause precocious puberty at a5 J! C& t2 [/ k' S5 x8 j. s
very young age. The physical findings in these boys
+ b3 K, G; K/ S8 o% e f9 E/ owith this disorder are full pubertal development,, q0 D% o X( J0 ^
including bilateral testicular growth, similar to boys/ R- e# s6 L) s1 }5 A6 |
with CPP. The gonadotropin levels in this disorder
& `9 ~# ~0 Y1 ?are suppressed to prepubertal levels and do not show
! e% N# u# u' c$ n3 U+ mpubertal response of gonadotropin after gonadotropin-
* v! e4 {. K" i S9 mreleasing hormone stimulation. This is a sex-linked
9 P7 M* t: Y$ b' l0 F) vautosomal dominant disorder that affects only
0 q- I/ R7 b- q: ]males; therefore, other male members of the family
- c; Y( e8 L7 h' ?1 s5 k# \may have similar precocious puberty.3, z" R* Y9 F7 v; g2 ^
In our patient, physical examination was incon-
. A3 z7 o. L( I5 n/ B% psistent with true precocious puberty since his testi-
9 @8 I) g- c2 p0 V6 Acles were prepubertal in size. However, testotoxicosis& N' e7 b, q+ E U2 A! @
was in the differential diagnosis because his father
- x* u$ M+ g) ]- ]started puberty somewhat early, and occasionally,; a; z2 n9 F7 C$ y2 z6 l
testicular enlargement is not that evident in the1 _$ s8 z. I% s' B: M; M, d* ^
beginning of this process.1 In the absence of a neg-
- Z$ A2 M) p; M# `8 hative initial history of androgen exposure, our5 V* x7 c( s: ], }' B& I$ y6 e
biggest concern was virilizing adrenal hyperplasia,
! w- C7 J: ?; J7 seither 21-hydroxylase deficiency or 11-β hydroxylase
1 J2 ~; B! l/ e4 _" G" t) I# Qdeficiency. Those diagnoses were excluded by find-
: P8 Z# I$ }4 j9 X/ ]6 e8 Ying the normal level of adrenal steroids.
/ S% ~8 S; k: {The diagnosis of exogenous androgens was strongly
& U h: M5 n: t: f0 X4 x/ Csuspected in a follow-up visit after 4 months because
( Q/ l+ H8 ^7 F. } Cthe physical examination revealed the complete disap-
% f- g& z% i2 D8 _# `& Y, M" rpearance of pubic hair, normal growth velocity, and- R; G6 N3 `1 `( X& {
decreased erections. The father admitted using a testos-, h. s& p' h2 ]3 ?% m
terone gel, which he concealed at first visit. He was( U+ w! G5 }3 w$ z. t
using it rather frequently, twice a day. The Physicians’
( s3 W9 W' W/ e6 tDesk Reference, or package insert of this product, gel or7 R$ e4 _6 W8 u/ u* u* `
cream, cautions about dermal testosterone transfer to3 _6 R0 e2 N" m' }
unprotected females through direct skin exposure.
8 N# t1 F- Z. `9 l& W( S' R& eSerum testosterone level was found to be 2 times the
. ~7 H# B" L6 s$ u# F8 I Z5 Rbaseline value in those females who were exposed to
9 V! u$ i# a7 meven 15 minutes of direct skin contact with their male+ N W: k/ T& o8 q
partners.6 However, when a shirt covered the applica-# } g9 V& f( H; I- t9 r
tion site, this testosterone transfer was prevented.( [% A" [ K7 r: ?8 L
Our patient’s testosterone level was 60 ng/mL,
8 a! l* Q9 e# y( fwhich was clearly high. Some studies suggest that
/ U. F1 O& {# ~0 o) Edermal conversion of testosterone to dihydrotestos-
% g0 o+ |, u+ w' S: f Q) {terone, which is a more potent metabolite, is more2 n, u* N+ K" K' R7 f# _2 t5 Z- m
active in young children exposed to testosterone% t6 K- N! j# q. E6 h0 h
exogenously7; however, we did not measure a dihy-$ G) u5 n0 Y6 K/ d# J' Q6 Z5 `& ^! F# O
drotestosterone level in our patient. In addition to# |, b8 g I8 g1 F+ p" X
virilization, exposure to exogenous testosterone in
: j5 }8 t* I2 z* Y7 dchildren results in an increase in growth velocity and4 s7 b) N. d' m( b3 O. k
advanced bone age, as seen in our patient.
4 g8 f3 ^: X! D" B- |5 yThe long-term effect of androgen exposure during
R- H+ @" W! c, a' E; \" Bearly childhood on pubertal development and final
! L" N7 D* x) a& @% W" q# M6 P9 padult height are not fully known and always remain" H& T& R, b' n9 {
a concern. Children treated with short-term testos-
+ R, |, O5 C, R* i% iterone injection or topical androgen may exhibit some
4 Y; K- J8 y9 B3 @acceleration of the skeletal maturation; however, after5 @! `0 f$ ` b
cessation of treatment, the rate of bone maturation
; D# i" E/ F7 o+ k# ^2 ~decelerates and gradually returns to normal.8,9% ~" D* g+ d& F v0 j; _+ e+ M
There are conflicting reports and controversy
* b% q5 i) W9 a. w9 n# c/ eover the effect of early androgen exposure on adult
4 m3 g+ X) c# G- u; {& i, p6 d" E; @- Kpenile length.10,11 Some reports suggest subnormal
; J9 ]% ^6 p9 i3 l& ]3 R3 A4 }' |adult penile length, apparently because of downreg-! C Y Z4 D7 D/ T1 e# R% n ~, ~/ I
ulation of androgen receptor number.10,12 However,# T. \& _$ ^" ~* Q9 F: o1 t. \/ }7 O9 a
Sutherland et al13 did not find a correlation between
; g1 ?, M+ t4 i0 ~; a' n# w, _( Uchildhood testosterone exposure and reduced adult
% _( F- H' x* ^2 r! Lpenile length in clinical studies.
. S! ?# E, Q$ P5 L. q2 R6 B* XNonetheless, we do not believe our patient is
3 j" U: ^! s+ \) P5 \7 W, Ugoing to experience any of the untoward effects from
7 ?# a; ^3 [. Y) C p; A9 qtestosterone exposure as mentioned earlier because
8 Q+ g/ R. B: ?7 n Ithe exposure was not for a prolonged period of time.5 [5 k) a! \" p6 Q" k% P8 K
Although the bone age was advanced at the time of
( D* N3 c8 s7 D% Q; Ddiagnosis, the child had a normal growth velocity at
& C1 N( w. N/ o. jthe follow-up visit. It is hoped that his final adult+ s3 n |% [7 V/ k, e* n* [! u" y
height will not be affected.
+ F" a! F ~2 \- A' e5 e& e6 wAlthough rarely reported, the widespread avail-% R+ ]* x S! \
ability of androgen products in our society may' _# Y, N3 C( e3 s6 R; y9 t# Y9 `
indeed cause more virilization in male or female2 n' \& Y9 f4 w/ ^) u+ |. X
children than one would realize. Exposure to andro-+ x% L) t/ ]6 @% z% E o! P
gen products must be considered and specific ques-$ B% O4 t7 ~3 L# P
tioning about the use of a testosterone product or
9 S: e- Z1 `! b1 U5 p {* L$ qgel should be asked of the family members during
2 \" L# N: g F7 A4 cthe evaluation of any children who present with vir-% a: ?- I0 q' Q
ilization or peripheral precocious puberty. The diag-
* ]! H# e t4 Knosis can be established by just a few tests and by
# y, ?$ ?5 N# x/ s! {appropriate history. The inability to obtain such a9 j3 `2 F/ n" K6 r2 O9 K J+ ] f
history, or failure to ask the specific questions, may
2 D+ B- h. t" D3 ^8 dresult in extensive, unnecessary, and expensive6 K$ H+ W! p, d& |- c
investigation. The primary care physician should be# v$ k" J/ u. R- G/ v# G. e
aware of this fact, because most of these children
- V5 v* S5 P. f/ |5 G- D/ A+ Hmay initially present in their practice. The Physicians’
) R8 t" o- d* ~8 CDesk Reference and package insert should also put a6 ^9 s8 e& x- ]6 C
warning about the virilizing effect on a male or
& P3 I6 N! Q/ _- ?; B6 r% Ffemale child who might come in contact with some-/ D) O- Y1 f$ g% T
one using any of these products.. l* l2 {$ s( l8 {
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/ u+ B0 J8 w7 S, B5 N0 t4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual
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exposure to testosterone. Pediatrics. 1999;104:e23.8 ^% j$ \ W6 d, o" t
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) a: N; r% N$ }; X( _* L6. Physicians’ Desk Reference. Androgel 1% testosterone,
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