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is a significant concern for physicians. Central. j3 r; a. v0 d
precocious puberty (CPP), which is mediated
4 P6 d9 O. Q8 W1 c0 Qthrough the hypothalamic pituitary gonadal axis, has& _% Y* t; y9 S3 W( `
a higher incidence of organic central nervous system
# E X1 m0 b7 Slesions in boys.1,2 Virilization in boys, as manifested- O/ Q# D9 s2 m
by enlargement of the penis, development of pubic. u) D2 r2 d% J1 G
hair, and facial acne without enlargement of testi-) l; X( I' u0 E/ x
cles, suggests peripheral or pseudopuberty.1-3 We
" H+ {: w3 t# i# M; C- l# Ireport a 16-month-old boy who presented with the* g) ]. D$ T2 W5 ~
enlargement of the phallus and pubic hair develop-5 T. K) v* ]) w" u- W8 a
ment without testicular enlargement, which was due
# H! I" k M8 f- m$ B' sto the unintentional exposure to androgen gel used by; x* R6 ^% c+ G% S* ?6 u
the father. The family initially concealed this infor-3 d% y3 O% h' W* Z" m4 S
mation, resulting in an extensive work-up for this
( x8 V9 ~2 e% d, _5 M- p. y; C; Fchild. Given the widespread and easy availability of$ e9 w9 f; }$ B: i( @
testosterone gel and cream, we believe this is proba- g4 B" Y0 \* w7 p
bly more common than the rare case report in the
( t/ n3 p* a& n& Zliterature.4- c; K- D4 o/ e& [5 `
Patient Report, y0 P7 n: P, o1 l: |
A 16-month-old white child was referred to the+ o$ j: ]* e5 K8 Z( x/ ?
endocrine clinic by his pediatrician with the concern
) a+ Z, k# \) Sof early sexual development. His mother noticed
+ v5 k9 Q1 N' @- {( alight colored pubic hair development when he was A) ^ B$ f: ^' O* @
From the 1Division of Pediatric Endocrinology, 2University of5 b( U) _4 c% C/ I. G$ z. J2 X
South Alabama Medical Center, Mobile, Alabama.8 \5 S- |9 d. c! V, p
Address correspondence to: Samar K. Bhowmick, MD, FACE,
- M E' B5 ^" \+ UProfessor of Pediatrics, University of South Alabama, College of
5 k; [" ?: |( a4 l- |Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;* v( r0 ?: l1 W- o' H: y8 W1 h
e-mail: [email protected].( j5 _) X) W+ ?/ ]7 H7 N
about 6 to 7 months old, which progressively became' X9 w- P) ~8 {/ j: d
darker. She was also concerned about the enlarge-
' @1 {! }! A7 L& [& h- j4 qment of his penis and frequent erections. The child
) D' a6 Z0 g9 G5 X d% t: `was the product of a full-term normal delivery, with! h0 A8 ^) Q. j! h) M8 f
a birth weight of 7 lb 14 oz, and birth length of: h2 U2 S) I9 ]9 d$ l" f" R% `
20 inches. He was breast-fed throughout the first year
( w8 ^& \$ a9 C) Nof life and was still receiving breast milk along with7 T2 W4 X8 `1 ?+ L* n! h; h9 f
solid food. He had no hospitalizations or surgery,8 K( h6 k O, V7 ]$ P' s7 n, o
and his psychosocial and psychomotor development
) w" B( N0 x- L( @& P% y. \4 c# k+ Cwas age appropriate., a0 t- a1 f7 z
The family history was remarkable for the father,: U9 G; ? q/ i( _0 U* ]: ~ P
who was diagnosed with hypothyroidism at age 16," B/ N/ |; ]+ Y2 Y+ N Y, X# v1 j
which was treated with thyroxine. The father’s6 n+ k, K: V* ?
height was 6 feet, and he went through a somewhat
( D M6 h2 h4 o0 R! F1 t. ^early puberty and had stopped growing by age 14.
1 u8 C) h! X8 f/ uThe father denied taking any other medication. The1 [& T% O0 {, R$ _
child’s mother was in good health. Her menarche
$ p7 a7 W* J; i+ i/ _# {was at 11 years of age, and her height was at 5 feet
, ], ~0 h) E! }4 A9 Z7 l; E7 o* Y8 g5 inches. There was no other family history of pre-
' J6 z$ U2 X1 N' X; l1 x$ Q; v% acocious sexual development in the first-degree rela-
, _1 A! o/ G* ~( Q6 V9 @ z) G- Ktives. There were no siblings." [, _1 o/ p) O0 E
Physical Examination9 W! D: G2 ~& |8 `* F& ?. v
The physical examination revealed a very active,( x/ F! s, J4 E$ ?5 |1 G
playful, and healthy boy. The vital signs documented
" ^" u$ C0 p! W! Ya blood pressure of 85/50 mm Hg, his length was- F0 b7 | J2 C( u& z
90 cm (>97th percentile), and his weight was 14.4 kg
% `2 ^6 X L6 e; z% ?; @5 d* k(also >97th percentile). The observed yearly growth
* x, O5 B x* X( M! z$ p$ Ovelocity was 30 cm (12 inches). The examination of
& u/ w1 i$ c" l& ^: c8 t/ p4 lthe neck revealed no thyroid enlargement.2 C% ^9 M) s7 R) I$ F
The genitourinary examination was remarkable for
. P- x# ?4 p2 r" Q9 ]enlargement of the penis, with a stretched length of7 C$ ]# V5 @* E
8 cm and a width of 2 cm. The glans penis was very well& G! @% U+ J- b* L" f8 }
developed. The pubic hair was Tanner II, mostly around
$ }" x; H" P" y8 k# \0 g540
8 ?8 s- t" b0 C6 y7 {- jat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from' B6 K" i* E% ?4 b, ~. O6 k
the base of the phallus and was dark and curled. The
; x7 M% r+ {* L( p7 wtesticular volume was prepubertal at 2 mL each.
) s* k/ q2 z' B( f, M7 r7 ]& u: k! l) AThe skin was moist and smooth and somewhat
, k2 G, T7 n) O7 c! ]( koily. No axillary hair was noted. There were no5 f. z- Z! d+ n* P2 g; f5 O/ T* l
abnormal skin pigmentations or café-au-lait spots.; q* h- |. f- ~/ R9 T# l* @
Neurologic evaluation showed deep tendon reflex 2+
4 a* D/ }. a# Obilateral and symmetrical. There was no suggestion- x) R4 n3 h, y, a& V
of papilledema.4 z( \3 O, |% c2 l2 Z2 e9 S
Laboratory Evaluation
* U1 w, ^1 J" V6 v& ~The bone age was consistent with 28 months by( q _$ H* @& K7 G% x( r
using the standard of Greulich and Pyle at a chrono-2 v% h3 ~+ X6 R* x
logic age of 16 months (advanced).5 Chromosomal
& s' r1 _4 G% a" N/ Q; ^) Fkaryotype was 46XY. The thyroid function test
3 V4 t8 i5 M+ Q0 I' ^. j Ashowed a free T4 of 1.69 ng/dL, and thyroid stimu-
; H; Z, f0 f# b, p/ H- @6 F4 D0 _lating hormone level was 1.3 µIU/mL (both normal).
; F( \& x3 ]2 GThe concentrations of serum electrolytes, blood
6 C4 n4 g9 V# qurea nitrogen, creatinine, and calcium all were* \# _5 ~0 |: b7 j$ ^
within normal range for his age. The concentration
5 k0 s* X5 ?: N1 b+ @of serum 17-hydroxyprogesterone was 16 ng/dL
. |" z1 n. E% Y. f4 f; j(normal, 3 to 90 ng/dL), androstenedione was 20% E; c5 W( b4 U1 y
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
' m% W) v4 q: [terone was 38 ng/dL (normal, 50 to 760 ng/dL),9 K' p- {' G: S0 ]# A- }$ A
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
I* D0 \. `: ?$ J) \49ng/dL), 11-desoxycortisol (specific compound S)8 n L, p. }% F2 Z; j- r
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
4 h( c: f2 g& {0 v6 ~; D! N; p! r" etisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total4 l7 K" u% H& y( q2 |5 e
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),! z* Y, a1 F4 P1 _* u; b
and β-human chorionic gonadotropin was less than( \4 |$ J1 Q' g0 T6 o6 ]$ m* I
5 mIU/mL (normal <5 mIU/mL). Serum follicular
, C5 u- n6 J( a' Istimulating hormone and leuteinizing hormone
* j! U& C8 G9 ?) Y5 ^" \concentrations were less than 0.05 mIU/mL
c. K6 L" w0 @0 k(prepubertal).1 T8 I& t: B2 G7 n" R) S
The parents were notified about the laboratory' T9 {0 M+ V# f m# {# |
results and were informed that all of the tests were
: V. P o3 y7 t1 Mnormal except the testosterone level was high. The
6 ` ?: T3 B6 y. v J4 u4 Cfollow-up visit was arranged within a few weeks to& b% X0 ~9 \0 h2 z0 L; N
obtain testicular and abdominal sonograms; how-
) }. Y$ {; F1 N8 I5 e1 _# K- |ever, the family did not return for 4 months.( y; s6 B& i( z* E3 p5 [
Physical examination at this time revealed that the
8 R; x1 K5 t" W; q( [child had grown 2.5 cm in 4 months and had gained
( u" v' X: V/ {+ k0 `9 ~& K, c( _2 kg of weight. Physical examination remained
' S, L9 F1 m7 D' d/ ^7 {. uunchanged. Surprisingly, the pubic hair almost com-
9 n- n6 h. K0 f3 b, a: @, z3 k. Vpletely disappeared except for a few vellous hairs at
$ ~6 a$ d4 i7 q% B$ G, T2 O, s' zthe base of the phallus. Testicular volume was still 2
2 D7 ?" j- b. x4 O+ v' WmL, and the size of the penis remained unchanged.
. `+ U# x+ v0 KThe mother also said that the boy was no longer hav-1 q+ k7 h% [( q8 ]" X% W/ j6 o6 h( H; S
ing frequent erections., U1 L8 \' _6 o
Both parents were again questioned about use of
) x+ k6 o" C7 W+ b6 pany ointment/creams that they may have applied to, C# k/ m# F$ z. A
the child’s skin. This time the father admitted the
) ?( `7 d* ^- O8 aTopical Testosterone Exposure / Bhowmick et al 541) X' ]7 d- U* {; d6 t+ P
use of testosterone gel twice daily that he was apply-
4 p5 ]2 Z# c; N( m: N; `0 zing over his own shoulders, chest, and back area for2 T) C! D- f2 z4 q! o& r
a year. The father also revealed he was embarrassed7 _( ]- O5 b2 R4 k. P$ t
to disclose that he was using a testosterone gel pre-6 W9 D) b) s0 H$ y; A. n$ ?: j: O
scribed by his family physician for decreased libido
, v/ O& G% R2 o# @$ \secondary to depression.. J8 y- @0 q" C8 S; ^
The child slept in the same bed with parents.
8 k/ W) K N. G# R* M" a# H- y6 tThe father would hug the baby and hold him on his
! o& Q9 v8 }# `9 {, V: mchest for a considerable period of time, causing sig-3 u: y4 s4 ?3 Y/ _8 F. g; k
nificant bare skin contact between baby and father.& V* i+ n! B: W; K
The father also admitted that after the phone call,
% [+ y) U3 I8 s! W! `! uwhen he learned the testosterone level in the baby& g6 p6 g. s" A; ^9 O- x/ }4 d
was high, he then read the product information
% ]! T: O; v/ N! n, z- P; cpacket and concluded that it was most likely the rea-# ?3 S$ T4 O6 K+ y6 ]$ F& f! _
son for the child’s virilization. At that time, they
! z) A2 J9 P% B( z- `/ Udecided to put the baby in a separate bed, and the- L/ J: G7 C: @7 v Q7 e
father was not hugging him with bare skin and had
& |# `$ `5 C( Z9 y' _% Cbeen using protective clothing. A repeat testosterone
% y0 e$ q- i; l+ n5 ztest was ordered, but the family did not go to the( t, f2 }5 v, d, Q5 D ]) [& z* P j
laboratory to obtain the test.
+ f, A+ [: C% w4 V( |Discussion
) E. N, j. p$ X6 K9 l) G% PPrecocious puberty in boys is defined as secondary u- `! O( {3 ~; w
sexual development before 9 years of age.1,4
5 F3 Y$ b8 H4 Q3 {$ G" UPrecocious puberty is termed as central (true) when) J' P, x5 H2 b# |" Z
it is caused by the premature activation of hypo-
D# Y% p: B6 ]' @3 ythalamic pituitary gonadal axis. CPP is more com-0 X1 o) {) [% S& }1 @% V
mon in girls than in boys.1,3 Most boys with CPP/ b4 t8 F! E& J5 p* f+ U% P; G
may have a central nervous system lesion that is
% N/ u: F* j" { lresponsible for the early activation of the hypothal-
/ u! c* s3 F0 n2 `* Pamic pituitary gonadal axis.1-3 Thus, greater empha-
5 c5 D; v T: x* _$ |2 x7 x$ V1 ^sis has been given to neuroradiologic imaging in: P$ C3 [% E- h, ~
boys with precocious puberty. In addition to viril-
) W$ K, E( N/ q: o& j+ U6 M$ Dization, the clinical hallmark of CPP is the symmet-
% g5 ~ P; S) i+ {# prical testicular growth secondary to stimulation by3 X8 L5 W# J+ N. t7 W- W
gonadotropins.1,3" C& g& G* d: t1 _; w6 v# q9 T w# `
Gonadotropin-independent peripheral preco-
/ g8 r8 x8 [ @ hcious puberty in boys also results from inappropriate+ ?. H& K6 `" Q* V1 X
androgenic stimulation from either endogenous or
% ^3 q$ F! M; n. Q. T6 u, ]exogenous sources, nonpituitary gonadotropin stim-
7 a7 ?1 d! X' o1 ~7 V3 culation, and rare activating mutations.3 Virilizing
j9 p* e7 F1 @4 ?congenital adrenal hyperplasia producing excessive$ M/ O" p, ^2 R" Q
adrenal androgens is a common cause of precocious- j+ E- G2 U1 N0 I% A/ A8 x4 H
puberty in boys.3,4
# T* P. t L5 z) h! x2 DThe most common form of congenital adrenal3 }2 F+ x+ N5 a+ |
hyperplasia is the 21-hydroxylase enzyme deficiency.( o3 P' v5 t: I% @& g4 l4 d
The 11-β hydroxylase deficiency may also result in
2 G/ r; q: u: c, c0 fexcessive adrenal androgen production, and rarely,1 s% D6 @/ u% ^9 s9 ]
an adrenal tumor may also cause adrenal androgen
- U% g: M" f( t( U0 c7 |- Gexcess.1,3
) `" T" E5 [0 q5 [3 Zat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from# O& [9 ` Y# H0 a3 I8 R2 ^
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
$ O; G' ]7 k# s4 i8 D, `A unique entity of male-limited gonadotropin-% F; M) O$ r8 g; V
independent precocious puberty, which is also known6 \1 c$ t' I- k
as testotoxicosis, may cause precocious puberty at a& [+ C7 i/ k( e6 O$ o; V
very young age. The physical findings in these boys
: y( e1 L- e \$ Q, C ^( Fwith this disorder are full pubertal development,
% l4 u+ n! Q5 o6 s* w! H5 {3 x+ Eincluding bilateral testicular growth, similar to boys
# @' h- k! P3 z, Q' ^$ h% N( Z2 jwith CPP. The gonadotropin levels in this disorder
4 g7 t+ F' C4 f7 O; b- vare suppressed to prepubertal levels and do not show
' @+ e. X1 ` L1 ^6 Mpubertal response of gonadotropin after gonadotropin-6 G3 Y& _, E* X X0 M5 V
releasing hormone stimulation. This is a sex-linked
! _: B0 T1 n; T; e+ ?autosomal dominant disorder that affects only
+ {' S, }' L# j3 i/ K# X) p+ kmales; therefore, other male members of the family
* w: C& T, @( e. rmay have similar precocious puberty.37 J6 F( V/ F- y; E# }
In our patient, physical examination was incon-
6 w2 U& J8 B7 ^7 v; L Y0 b6 K5 qsistent with true precocious puberty since his testi-
0 w9 Z' d* j a4 fcles were prepubertal in size. However, testotoxicosis
. C W; [# O& `4 owas in the differential diagnosis because his father
( U! N' `7 J# Nstarted puberty somewhat early, and occasionally,
* z2 L8 K# J1 J1 |testicular enlargement is not that evident in the
, `0 f% q6 U6 ]# w$ R% y3 _" qbeginning of this process.1 In the absence of a neg-8 r8 J$ W# }! l! W
ative initial history of androgen exposure, our
& Y% R5 Q4 G o4 i5 \- g$ a0 rbiggest concern was virilizing adrenal hyperplasia,. e( ?! v- {; _+ i! }
either 21-hydroxylase deficiency or 11-β hydroxylase3 r* Y- m2 f6 Z+ u% b4 ?5 P% D
deficiency. Those diagnoses were excluded by find-2 I0 G( z$ X2 u9 z9 W
ing the normal level of adrenal steroids.
( H, R, `$ i2 `+ PThe diagnosis of exogenous androgens was strongly
# x' c& g" ^* R# ?suspected in a follow-up visit after 4 months because) k: [/ v0 u- `9 ]& j4 o. n1 I
the physical examination revealed the complete disap-
+ u. a7 ^5 B, H( Kpearance of pubic hair, normal growth velocity, and0 s& X& r5 m# u
decreased erections. The father admitted using a testos-
7 x+ P6 C* p: Z$ J2 b, [* Oterone gel, which he concealed at first visit. He was
% a, K3 }/ q$ F) p9 }" b9 ^using it rather frequently, twice a day. The Physicians’
L- ^; x" l- p# iDesk Reference, or package insert of this product, gel or! e& S% t* R0 S. X- q5 _
cream, cautions about dermal testosterone transfer to( {# ]2 p3 a3 `) C& J
unprotected females through direct skin exposure.
2 y, G4 X7 {) c3 n( z8 ESerum testosterone level was found to be 2 times the
) S) U& t( Q0 Tbaseline value in those females who were exposed to
$ l9 O, D- X* p, weven 15 minutes of direct skin contact with their male
. b9 i: C% R; x( H) i: @partners.6 However, when a shirt covered the applica-0 W/ W/ i% s8 Q) [
tion site, this testosterone transfer was prevented.% k. a0 V1 R: T
Our patient’s testosterone level was 60 ng/mL,
3 r; \3 T6 w2 y* Fwhich was clearly high. Some studies suggest that
, B4 u, w6 x4 y/ r, g: rdermal conversion of testosterone to dihydrotestos-* n. i8 @5 @, m4 [# w8 }+ |& L
terone, which is a more potent metabolite, is more
! [; R' h! P. {2 `" I1 Pactive in young children exposed to testosterone5 B5 q7 ^# d/ f: N' W
exogenously7; however, we did not measure a dihy-% |8 v7 Y% `* D. Y1 V1 K# o
drotestosterone level in our patient. In addition to2 C" s' V% s$ C/ G/ u2 C& _
virilization, exposure to exogenous testosterone in
, S4 l2 C) Y) r, zchildren results in an increase in growth velocity and
! i6 c B4 h d) @! O$ G+ tadvanced bone age, as seen in our patient.
+ }/ `# k# j# p- vThe long-term effect of androgen exposure during0 }( G8 N$ E# K/ }+ `
early childhood on pubertal development and final
; Z7 i9 f. a7 A& r* badult height are not fully known and always remain% |: X! s, r2 {* M. q& ^2 ?1 o
a concern. Children treated with short-term testos-5 l+ ]; J; E% T) r9 P/ }: o) h
terone injection or topical androgen may exhibit some
" I# j: }7 [/ O, s$ e* I! H cacceleration of the skeletal maturation; however, after
8 `) B. l8 L3 v zcessation of treatment, the rate of bone maturation
" q7 `( `/ L2 A) rdecelerates and gradually returns to normal.8,95 B9 g9 P" m% ]3 s
There are conflicting reports and controversy
1 \! X, Z0 N8 h Z) V( v Jover the effect of early androgen exposure on adult
: o& ~2 C. b. y. ^- X" ypenile length.10,11 Some reports suggest subnormal5 v/ {! G$ S8 |6 V# B+ O# A" n2 N
adult penile length, apparently because of downreg-3 F; r/ ~5 _+ P% |, C+ j' W
ulation of androgen receptor number.10,12 However," c( ]+ `8 A# c; e8 ]/ i/ J2 d' [ q/ Q
Sutherland et al13 did not find a correlation between
9 V+ c) b$ \1 c" echildhood testosterone exposure and reduced adult% D; ~6 D# `( A/ d- d
penile length in clinical studies.1 ~/ r# C) ` L7 j. {! ?8 }4 s
Nonetheless, we do not believe our patient is
: A# ~" b$ q7 F: Z' X" xgoing to experience any of the untoward effects from
" S2 L2 O/ L$ a. a/ Jtestosterone exposure as mentioned earlier because% `- }' c9 e8 \& e% `$ J. W' N" z
the exposure was not for a prolonged period of time.& e; r, G7 M% f
Although the bone age was advanced at the time of; y2 q Y% c* h9 g" H1 t
diagnosis, the child had a normal growth velocity at n, _/ \8 `6 y- n( @/ q
the follow-up visit. It is hoped that his final adult C7 B& c5 C! h
height will not be affected./ b/ k8 ?# _- Y9 g" u9 ~) O
Although rarely reported, the widespread avail- o* M v6 ]0 |
ability of androgen products in our society may
3 C) {, r3 c/ oindeed cause more virilization in male or female ^$ w( ]0 {$ q+ X ?1 e
children than one would realize. Exposure to andro-
# C1 M% r7 e! R1 Jgen products must be considered and specific ques-% F) f N% Y4 _, i. \5 X
tioning about the use of a testosterone product or
$ g, G2 O4 }9 Z$ V' W Q5 Rgel should be asked of the family members during
. z$ {% t6 ~1 F. k5 {the evaluation of any children who present with vir-# g3 B, V! ~& G" U, ~' j
ilization or peripheral precocious puberty. The diag-
2 Y3 ~' j' }8 x6 ^ |+ r8 Jnosis can be established by just a few tests and by
, f) @+ u, `' ^ s+ \; Vappropriate history. The inability to obtain such a
4 v* [# t+ z0 f xhistory, or failure to ask the specific questions, may, \! _, W( m* a3 u: h
result in extensive, unnecessary, and expensive7 i. A: F; C& B$ |0 q) L$ Z
investigation. The primary care physician should be
" E G& ?5 l& V" g0 b: m# e3 Waware of this fact, because most of these children. B4 _3 Q: Y6 V3 [$ {+ Z
may initially present in their practice. The Physicians’
, j5 p* n) n+ t1 l" m9 A% S: ODesk Reference and package insert should also put a
0 Z+ ~3 [" R$ J6 X; b* R8 Rwarning about the virilizing effect on a male or2 r) C) H: ~9 e2 B' Q5 {
female child who might come in contact with some-
& q% K% c, T G/ d" {2 zone using any of these products.5 [" g; f6 {$ u8 _/ K
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Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;0 C" N" d" F( s7 ]- Q
2002: 565-628.% ^! u2 m1 m& f& `
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0 A( X* R' T8 @& G9 g! g* {2 npuberty in children with tumours of the suprasellar pineal
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Stanford, CA: Stanford University Press; 1959.4 d4 L0 _, [* S
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Economics Company, Inc; 2004:3239-3241.& {8 P" c3 f9 K
7. Klugo RC, Cerny JC. Response of micropenis to topical" D& Z8 e5 V7 O5 a& i7 x; I# \
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