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is a significant concern for physicians. Central
; ~$ I3 a3 K" l6 uprecocious puberty (CPP), which is mediated4 b$ Z0 B5 g3 B& _; v9 y, ~) y" h
through the hypothalamic pituitary gonadal axis, has+ U- |4 q8 \9 v1 C3 X: }3 O
a higher incidence of organic central nervous system
& y' l4 M) F6 a# dlesions in boys.1,2 Virilization in boys, as manifested% x0 e3 W; v9 p; @+ @% N
by enlargement of the penis, development of pubic" S0 ^! Q4 q8 d" X2 E
hair, and facial acne without enlargement of testi-3 x. o) H) l a/ C. L0 h' a
cles, suggests peripheral or pseudopuberty.1-3 We
& A" J6 G R6 x. @5 C3 V6 K5 n ireport a 16-month-old boy who presented with the
; {" ?8 J1 j% N: Z* X- A% z3 genlargement of the phallus and pubic hair develop-
0 L. ]5 e7 T L0 l' c, R x/ H6 Q- iment without testicular enlargement, which was due( I0 S3 v" O9 L
to the unintentional exposure to androgen gel used by
: F1 ~$ _7 l" tthe father. The family initially concealed this infor-' Y1 `9 U3 i; t# x) k X
mation, resulting in an extensive work-up for this" M& w" B/ V* o" u
child. Given the widespread and easy availability of
" E b' Y: c! \8 v. R3 I H/ r9 @testosterone gel and cream, we believe this is proba-+ N# X1 W/ N% v+ z% y
bly more common than the rare case report in the7 x: n' ^3 |1 u3 l& y# q% z
literature.4
! f, @" R' `% g$ ]Patient Report
- r, ?+ o* l0 c. ]A 16-month-old white child was referred to the3 H7 y- y( R8 N7 Q, j
endocrine clinic by his pediatrician with the concern" \0 A0 k4 L d, @8 x. F- Z
of early sexual development. His mother noticed
; v l r) S9 Q7 Vlight colored pubic hair development when he was. @) _' h1 N% f$ M) \2 T
From the 1Division of Pediatric Endocrinology, 2University of
% P# U6 _7 m1 S4 W# ~South Alabama Medical Center, Mobile, Alabama.4 A# O# a1 ^) o' z& A8 e3 R7 g5 g2 L7 o
Address correspondence to: Samar K. Bhowmick, MD, FACE,
# g4 B! z$ H% V/ z' I( iProfessor of Pediatrics, University of South Alabama, College of+ k9 n/ v4 d4 e; ?
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
" m8 z) X( J2 ^( U: r) _( k3 ae-mail: [email protected].8 `/ S. Y9 S) @
about 6 to 7 months old, which progressively became
2 v7 u5 ~' a# ]/ u1 A+ Ndarker. She was also concerned about the enlarge-) h, Y! E- k- N. C3 J+ d
ment of his penis and frequent erections. The child
6 n4 `) Q8 u- I5 z" l! pwas the product of a full-term normal delivery, with
) I' m) B' ]4 T0 z2 q, Ca birth weight of 7 lb 14 oz, and birth length of% m( u3 Z( g0 O; X
20 inches. He was breast-fed throughout the first year4 _' z$ u; _9 e# A- I
of life and was still receiving breast milk along with
9 b* f1 {) m" z$ W2 x: vsolid food. He had no hospitalizations or surgery,/ T1 K+ Z5 `% L
and his psychosocial and psychomotor development
9 G1 a7 J0 l1 {9 X: r8 T& q/ k, ~was age appropriate.
. o( {/ t$ U( {( \& kThe family history was remarkable for the father,' _, M8 ^8 f' O2 b# U
who was diagnosed with hypothyroidism at age 16,
+ c; g; o5 y G/ Z) n6 Xwhich was treated with thyroxine. The father’s
0 M' L* C; K# ^( jheight was 6 feet, and he went through a somewhat
) y; z6 N! T" eearly puberty and had stopped growing by age 14.4 R3 o8 U" A" P$ Z3 S" L$ c$ h2 Z
The father denied taking any other medication. The
0 |9 f% g2 W: h0 M. ^child’s mother was in good health. Her menarche- z* H8 s, I/ y- \% Q
was at 11 years of age, and her height was at 5 feet
" T+ ^) Z0 R2 D$ ]5 inches. There was no other family history of pre-0 P" B+ ?; x, y7 }( c+ u' W
cocious sexual development in the first-degree rela-% Y3 i' z1 s+ m2 [/ U, D
tives. There were no siblings.
' { b1 _$ S$ ^- @3 {% m: VPhysical Examination+ l2 w2 z9 i. B3 L" }
The physical examination revealed a very active,% M+ G6 c' V+ H3 j+ F
playful, and healthy boy. The vital signs documented
' E$ N3 |& _ x5 w& za blood pressure of 85/50 mm Hg, his length was, d, X) g! M. o0 E* f* _* o- T
90 cm (>97th percentile), and his weight was 14.4 kg6 r8 r# J6 |( K4 f& h- C
(also >97th percentile). The observed yearly growth
! V: U- s5 R3 m: w zvelocity was 30 cm (12 inches). The examination of
8 M2 ? ^+ E$ s0 m; ^8 l4 zthe neck revealed no thyroid enlargement.6 S" r% ^: Z. z0 i
The genitourinary examination was remarkable for
3 n l( t( a1 b8 d! Xenlargement of the penis, with a stretched length of
- C2 C: r2 H4 W8 m! B4 ]0 b8 cm and a width of 2 cm. The glans penis was very well! W l# k* p5 g. k! F( p: t
developed. The pubic hair was Tanner II, mostly around& d3 k! G" S5 S2 l& j( J
540
: b/ r7 V/ y; T7 s" Jat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from, L+ `6 h' {& o/ W' m6 h* i3 `
the base of the phallus and was dark and curled. The
# W% t* ^/ a/ ?' m# l+ s" o ltesticular volume was prepubertal at 2 mL each., B) c. h0 N( h! b$ ^ P' o
The skin was moist and smooth and somewhat
2 i4 ]+ _* A) C3 X# ^5 U% E4 Moily. No axillary hair was noted. There were no
: c( M# `1 I4 `/ ?abnormal skin pigmentations or café-au-lait spots.$ Y# g5 S$ v5 p$ i z5 t
Neurologic evaluation showed deep tendon reflex 2+7 {- o: m, j) K+ [
bilateral and symmetrical. There was no suggestion7 ~' S. Q3 W9 c5 [' \" S0 |# \
of papilledema.
7 [, h* R: F$ @- G- \) LLaboratory Evaluation
* G# b9 A! w% X/ D$ DThe bone age was consistent with 28 months by( `5 g) O% J+ n8 U' [: K
using the standard of Greulich and Pyle at a chrono-
! Q/ Y A/ e B. \# ologic age of 16 months (advanced).5 Chromosomal) ^/ W+ d1 a2 t3 @ w S
karyotype was 46XY. The thyroid function test5 e7 R5 Y. P# v" R$ i7 R
showed a free T4 of 1.69 ng/dL, and thyroid stimu-# h; J6 ?/ f7 T5 G
lating hormone level was 1.3 µIU/mL (both normal).
' i& }& V1 }) N) Y4 b3 ?# GThe concentrations of serum electrolytes, blood$ f! O) ~) c6 J: k1 |1 k2 R2 o
urea nitrogen, creatinine, and calcium all were4 w% F \* D1 j" \; R
within normal range for his age. The concentration
9 a4 D5 n" J0 z( Q) c9 Nof serum 17-hydroxyprogesterone was 16 ng/dL
- _, N2 ~# n$ R" {% ?3 ?(normal, 3 to 90 ng/dL), androstenedione was 20/ p( B0 T& g5 N0 t
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
- c6 Y( N8 m4 V1 x f( W5 aterone was 38 ng/dL (normal, 50 to 760 ng/dL),
! S: m5 e' |; o" y4 Q4 Fdesoxycorticosterone was 4.3 ng/dL (normal, 7 to
4 }* R9 b; i3 S; ]5 t" X49ng/dL), 11-desoxycortisol (specific compound S)# l( z* c3 A: e
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
* N1 _. Q/ p& k3 }2 Z/ \tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total# h8 w1 ?- k: h9 N1 ?
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
. C7 w4 Y; J1 V) E8 W% wand β-human chorionic gonadotropin was less than$ K0 o; U4 R0 r, {. M2 x& }/ H
5 mIU/mL (normal <5 mIU/mL). Serum follicular
0 m0 O) }0 [& Hstimulating hormone and leuteinizing hormone* u! k: o8 z% e. Y5 }
concentrations were less than 0.05 mIU/mL
" q+ u: Q j1 v( R(prepubertal).
2 l- d( ]7 M# Y5 ^4 |( ]The parents were notified about the laboratory
& T' g* \+ M. y) A+ iresults and were informed that all of the tests were
( l8 g4 [ U$ |& W: I& ~/ gnormal except the testosterone level was high. The/ P1 d4 w9 t8 {4 w
follow-up visit was arranged within a few weeks to4 q" U. O6 a; ~$ P* U( L
obtain testicular and abdominal sonograms; how-; }+ W: g- v7 p! A( s1 t
ever, the family did not return for 4 months./ ?2 N( v) b5 n, w0 \; ^6 {- _
Physical examination at this time revealed that the0 `% M* `3 V4 [- w
child had grown 2.5 cm in 4 months and had gained7 o9 [ M2 T! _& G; X* I9 R
2 kg of weight. Physical examination remained6 n J2 B, C& p7 S2 G8 d
unchanged. Surprisingly, the pubic hair almost com-& J9 o1 h5 q" d, [1 K* W
pletely disappeared except for a few vellous hairs at
! z/ s5 h9 l* }: D c$ _+ f. ^: Gthe base of the phallus. Testicular volume was still 2
- {! ~# E/ W+ ]# H+ ]mL, and the size of the penis remained unchanged.
! q! U- Y g" i. |The mother also said that the boy was no longer hav-2 ^' o+ T. _- B6 d! i# w
ing frequent erections.
2 w3 l0 m6 X) Q- wBoth parents were again questioned about use of
6 C' B6 N3 \* J, eany ointment/creams that they may have applied to h) R1 f, u: @" P$ G, X: e, G
the child’s skin. This time the father admitted the
$ O- v+ j& V. M6 l4 J- fTopical Testosterone Exposure / Bhowmick et al 5414 `8 t0 Z# @7 C" A
use of testosterone gel twice daily that he was apply-7 y" T. Q+ f- Y6 i
ing over his own shoulders, chest, and back area for: c7 l6 n. f9 O$ Y
a year. The father also revealed he was embarrassed
- ?4 ?, d. W0 m& l+ M0 jto disclose that he was using a testosterone gel pre-
" G% x" L- X% x8 D$ Yscribed by his family physician for decreased libido
, |, y! q/ t$ j+ ]( n+ W" @& B+ Lsecondary to depression.4 c7 {6 c! P, ? V6 D
The child slept in the same bed with parents.9 S2 h0 g7 c; e
The father would hug the baby and hold him on his
* \+ O. Z6 [, f4 W. S4 V4 Nchest for a considerable period of time, causing sig-+ d( f7 }3 _* g( _: I+ ~" ]7 a" V6 f
nificant bare skin contact between baby and father.
, m; {7 t; Z% PThe father also admitted that after the phone call,. L. ]* |3 Y6 x+ f& z5 b
when he learned the testosterone level in the baby
[' F/ F) D8 l5 ]+ i1 V% j6 hwas high, he then read the product information
1 i1 ^- C6 ]; p9 M ^7 E* Cpacket and concluded that it was most likely the rea-3 Z5 \0 J/ @% N' [
son for the child’s virilization. At that time, they
8 q/ s0 D6 U ldecided to put the baby in a separate bed, and the4 \$ B/ I+ } R2 q; E6 ? n
father was not hugging him with bare skin and had
9 k3 r8 W( p5 e& q4 U( R# {been using protective clothing. A repeat testosterone3 N+ E1 E% ]) @7 I8 ]
test was ordered, but the family did not go to the4 Y5 I9 H* ]( E. ], f2 b
laboratory to obtain the test.. ~" Z" H0 ^; K$ t- D
Discussion
1 u* e" J" ]$ x- Y5 JPrecocious puberty in boys is defined as secondary
! Z T$ ^' S+ a) Esexual development before 9 years of age.1,4 x7 m' |# ]. E8 Q) c
Precocious puberty is termed as central (true) when
' q$ K/ f6 U4 l9 g9 T& eit is caused by the premature activation of hypo-% c- i% f5 a* I- b- c6 h4 P, I
thalamic pituitary gonadal axis. CPP is more com-
o7 } D) q0 N( a s" p$ amon in girls than in boys.1,3 Most boys with CPP
6 v3 m. N/ F r! m# {# A% D" rmay have a central nervous system lesion that is
5 E; a5 c' {; {5 a% T& J4 aresponsible for the early activation of the hypothal-
9 P5 s& @9 Z2 |% V% Y, L- C/ |amic pituitary gonadal axis.1-3 Thus, greater empha-
/ ]& E( ~/ _, M' @) Isis has been given to neuroradiologic imaging in
0 P6 U; I/ d! J0 o7 z. f* {boys with precocious puberty. In addition to viril-
2 `8 S& p& s4 x* H$ {' L0 t" dization, the clinical hallmark of CPP is the symmet-
. R; a5 Z( m5 z5 ?4 [rical testicular growth secondary to stimulation by4 R$ N% H# y' M# |
gonadotropins.1,3
, w3 Y6 ]6 t# ZGonadotropin-independent peripheral preco-
( }' \0 V* D1 S% r1 A/ j" t/ Z6 Bcious puberty in boys also results from inappropriate
; F* L2 g$ @- a1 n" X6 Oandrogenic stimulation from either endogenous or2 P. I; ]8 T! g* e
exogenous sources, nonpituitary gonadotropin stim-3 t, L. N2 O. E' g R( t% ^
ulation, and rare activating mutations.3 Virilizing* R+ \: e! `( k2 L) s
congenital adrenal hyperplasia producing excessive
, R# q4 p5 i% d: j& U! zadrenal androgens is a common cause of precocious
( l1 `2 E6 s) u8 }puberty in boys.3,4' K& y3 v# ]5 w8 u
The most common form of congenital adrenal7 }* o3 D" D! J/ |, a5 U
hyperplasia is the 21-hydroxylase enzyme deficiency." D6 ~6 R$ s# e# {+ A; o+ C
The 11-β hydroxylase deficiency may also result in2 X+ H# x: w) u3 m+ Y$ T
excessive adrenal androgen production, and rarely,
1 Q( ~1 A; p) ], D. c$ m1 fan adrenal tumor may also cause adrenal androgen
1 o- F, s! q4 Z+ E4 s$ `& K0 \5 V- sexcess.1,3! e/ y% S7 q* q0 J* k
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from) S" x0 s' A: _5 C- L/ x2 z+ K
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007( \& J9 r! q, U- O; ?
A unique entity of male-limited gonadotropin-& X( }5 Q, J+ ?
independent precocious puberty, which is also known4 t7 n! G$ C1 ^- S8 N/ q0 [
as testotoxicosis, may cause precocious puberty at a+ h1 M( Q c8 A( v2 ^1 X, L
very young age. The physical findings in these boys
' K+ w/ u/ v+ T7 |9 z; l4 C8 pwith this disorder are full pubertal development,: I$ E# w& e0 L# d% d0 J9 m! Z% T
including bilateral testicular growth, similar to boys
2 [$ [1 y6 @$ O7 _2 zwith CPP. The gonadotropin levels in this disorder
. i% N! S6 @7 Dare suppressed to prepubertal levels and do not show
4 ] B8 |; H* O" \5 j* b4 Jpubertal response of gonadotropin after gonadotropin-
* |) z& u( v1 g7 q3 b5 B Preleasing hormone stimulation. This is a sex-linked1 y0 k+ v% p! U8 p9 z
autosomal dominant disorder that affects only+ H; q% _$ c- y$ t- \+ P$ H# w
males; therefore, other male members of the family
5 ]4 M0 V; K. E# }6 z; g! }may have similar precocious puberty.3
0 H7 \9 a6 }; a* S8 B9 O" g" ?/ q3 g& fIn our patient, physical examination was incon-
" P d9 E! f# G- l& I% ^8 H2 S, O' esistent with true precocious puberty since his testi-
" ?% B2 i9 c$ g M1 ` X$ Gcles were prepubertal in size. However, testotoxicosis$ B! _2 W4 X# A$ _6 D
was in the differential diagnosis because his father' `& u- {, O& z0 u; G) x
started puberty somewhat early, and occasionally,
+ h- N! v. B6 A$ j* `) ]testicular enlargement is not that evident in the' G9 c% t7 U, E( h, Z
beginning of this process.1 In the absence of a neg-
) p( U$ F: f, z9 b7 Hative initial history of androgen exposure, our2 S9 s$ E# @: g) n; ]
biggest concern was virilizing adrenal hyperplasia,
# b; L& |* b4 L: q Z' G. Oeither 21-hydroxylase deficiency or 11-β hydroxylase: P: D; O9 o6 s
deficiency. Those diagnoses were excluded by find-$ |. s- l* f z/ x
ing the normal level of adrenal steroids.* t& Y# i- n3 H9 W9 O- {* X4 v
The diagnosis of exogenous androgens was strongly
6 A D4 L8 L8 R/ c7 N- wsuspected in a follow-up visit after 4 months because
+ Z7 L& l1 @) t- L# [. x$ vthe physical examination revealed the complete disap-, b! |+ v5 P1 [2 C
pearance of pubic hair, normal growth velocity, and
" j# [% N8 P; fdecreased erections. The father admitted using a testos-3 Y( z5 w/ I' o- M' q0 M/ w7 }/ S
terone gel, which he concealed at first visit. He was
L. [/ U5 y1 J) `, j. Dusing it rather frequently, twice a day. The Physicians’( d `- |, e6 V( o
Desk Reference, or package insert of this product, gel or$ w# X5 s5 t) A, T) P* e* R
cream, cautions about dermal testosterone transfer to
1 I" C6 N' P6 \9 ~3 Hunprotected females through direct skin exposure.
: S) e3 b8 D' }2 e; D1 B1 ySerum testosterone level was found to be 2 times the
% e2 [0 V& G( jbaseline value in those females who were exposed to" A# m+ d) @! Y; g, r0 C: v) Z4 @
even 15 minutes of direct skin contact with their male5 s6 {( [ y# L3 }: @4 c- W* a
partners.6 However, when a shirt covered the applica-
- R, v5 r4 u3 s6 _( x& Ntion site, this testosterone transfer was prevented.) V; D7 J/ A/ E+ h, o
Our patient’s testosterone level was 60 ng/mL,
' _+ R* C- S5 J4 H+ _, O4 \which was clearly high. Some studies suggest that, }, `! f+ ~* w6 M
dermal conversion of testosterone to dihydrotestos-
8 m' g; Y1 m! e, T" M" b7 n) g& Oterone, which is a more potent metabolite, is more0 A1 r2 O2 v% @9 Q
active in young children exposed to testosterone
6 n* W! `' g. y) @# zexogenously7; however, we did not measure a dihy-
( N. e& s a! F1 {3 z/ Ydrotestosterone level in our patient. In addition to8 c n/ i5 y) E& |
virilization, exposure to exogenous testosterone in# G$ G# S# L7 n* _" _- |
children results in an increase in growth velocity and8 s' C- J; d- M1 c' d% q/ @/ S. P
advanced bone age, as seen in our patient.
7 H: n- D- [. Q5 f3 YThe long-term effect of androgen exposure during+ {# y' G3 h1 e0 r
early childhood on pubertal development and final
3 Z) {) b3 _0 L6 Z; ^adult height are not fully known and always remain6 q: Q. k$ | c5 q
a concern. Children treated with short-term testos-
1 G9 F% j& k/ K4 `( iterone injection or topical androgen may exhibit some3 d$ B) V* Z; F4 f3 Q5 ]
acceleration of the skeletal maturation; however, after* x! [7 {# X/ l6 V
cessation of treatment, the rate of bone maturation
; X- D3 G# `) ?* ~ G% V! A, L, R" A/ gdecelerates and gradually returns to normal.8,9# l) L3 \7 }/ { o! @
There are conflicting reports and controversy
" ]* q) s* ^6 o7 y K8 |# ^5 |5 gover the effect of early androgen exposure on adult9 d0 [, i, k& A \, y$ N
penile length.10,11 Some reports suggest subnormal
1 Q0 s% P) M# P2 O6 yadult penile length, apparently because of downreg-" k- z( X8 u: x. C6 A
ulation of androgen receptor number.10,12 However,: Q" V* N9 ?7 @3 B' u$ N; _
Sutherland et al13 did not find a correlation between
* d! T9 i X9 \2 ?3 ^childhood testosterone exposure and reduced adult( h5 N: ], b, V
penile length in clinical studies./ I! w4 C J& _5 A( M
Nonetheless, we do not believe our patient is
$ B7 F# }& s5 o0 u( h4 v; rgoing to experience any of the untoward effects from
5 U& a1 e$ s' C/ ntestosterone exposure as mentioned earlier because/ F0 Z q' W1 T1 i
the exposure was not for a prolonged period of time.
6 \5 x0 O. \7 k* b% G( P8 kAlthough the bone age was advanced at the time of# H5 G# N, \! `: z3 T& P
diagnosis, the child had a normal growth velocity at
6 q% H# P* ~6 Fthe follow-up visit. It is hoped that his final adult3 p* ^9 U2 m5 e
height will not be affected.
& ?8 F; |# @, A3 i0 ?Although rarely reported, the widespread avail-
. x3 U: a* Y4 |# D# `5 M4 Wability of androgen products in our society may
! U S! \& s- v- w* M0 windeed cause more virilization in male or female
; ^' X& A$ s0 r' U' _children than one would realize. Exposure to andro-9 K5 I: q$ M# [1 K6 f9 y9 D& T
gen products must be considered and specific ques-0 t0 [- P/ S! U) \* d
tioning about the use of a testosterone product or
# b- B: m. P0 } h( o' H, Ngel should be asked of the family members during, `0 q1 F0 w$ H2 A
the evaluation of any children who present with vir-
, j! W( o- d- c% _' uilization or peripheral precocious puberty. The diag-0 e0 E# S0 [) y/ T$ G& @3 E
nosis can be established by just a few tests and by
* ~4 o5 t( D4 h6 a ]appropriate history. The inability to obtain such a
+ S6 i% R3 {9 k+ N; Vhistory, or failure to ask the specific questions, may
, w0 Q, `3 a2 v1 gresult in extensive, unnecessary, and expensive7 I) ]) w6 L% M- z) p
investigation. The primary care physician should be9 ]% I: C0 g5 p9 e
aware of this fact, because most of these children# }/ W4 j# @ c) R( o
may initially present in their practice. The Physicians’ ^- c6 Y: f% Y2 I
Desk Reference and package insert should also put a
9 M8 N. _( m0 _. lwarning about the virilizing effect on a male or
7 ~ r0 Z% e* R5 G! t v! O, @female child who might come in contact with some-% b# @6 R( @2 s4 W: E) L
one using any of these products.
\( j" W9 ^! _References
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exposure to testosterone. Pediatrics. 1999;104:e23., m; o, t$ q" x3 D- p: c; \
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& p* I2 F( j5 X% v; }* OStanford, CA: Stanford University Press; 1959.
! p4 i0 c7 F0 S. K) ]( b6. Physicians’ Desk Reference. Androgel 1% testosterone,5 W+ ~' F$ \' y: S
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1 Q# \( z$ F: i* z" y; @9 l ?' P; K7 ^2 X4 t7. Klugo RC, Cerny JC. Response of micropenis to topical) A3 t. {7 g5 ?7 h: n$ f
testosterone and gonadotropin. J Urol. 1978;119:" _0 T% R/ |3 R8 f
667-668.
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