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is a significant concern for physicians. Central
& @. }# l9 ^1 O! T1 q3 m. T# t5 Zprecocious puberty (CPP), which is mediated
6 F+ ]4 ~; ?) Y. T1 q. Q( lthrough the hypothalamic pituitary gonadal axis, has+ S q# X' [ |& T$ K/ w1 R ?
a higher incidence of organic central nervous system
2 P! r7 P" k& i, w, a6 Alesions in boys.1,2 Virilization in boys, as manifested
2 v) ~8 P! I5 w' O% @6 b- ^& Rby enlargement of the penis, development of pubic
0 V4 y7 A. \* f' E# ihair, and facial acne without enlargement of testi-
( K- T* \* p( Lcles, suggests peripheral or pseudopuberty.1-3 We
/ {2 `) t% x3 }' S2 Kreport a 16-month-old boy who presented with the! ]' J: W" U0 D1 g) \+ _
enlargement of the phallus and pubic hair develop-! K- W6 u! E: u2 o0 o8 c/ n
ment without testicular enlargement, which was due9 D3 [9 i% |4 q3 z; E$ F. U8 C
to the unintentional exposure to androgen gel used by
7 e9 |8 v4 Y1 ~9 I U+ uthe father. The family initially concealed this infor-- E2 O9 U, `9 T2 H
mation, resulting in an extensive work-up for this
0 z2 S. L& |0 h' i9 m" ~& nchild. Given the widespread and easy availability of& d7 @, @# a N- \* z# u
testosterone gel and cream, we believe this is proba-
' _2 U0 `5 E3 z8 O1 M: b2 i! f; }bly more common than the rare case report in the
: m# s- Q% U% v1 j4 V$ Zliterature.4" s2 V6 u D2 ~7 Z4 c
Patient Report" K/ b0 h( K3 h5 Z/ L
A 16-month-old white child was referred to the( S; j0 l7 u; B0 E" G$ Z3 z
endocrine clinic by his pediatrician with the concern- Z7 H1 r) S$ ?/ H- O
of early sexual development. His mother noticed
' h: v' t: c( f$ w, Llight colored pubic hair development when he was4 K6 d& ^) n3 m) _. V
From the 1Division of Pediatric Endocrinology, 2University of3 E5 f- n8 }. G9 {
South Alabama Medical Center, Mobile, Alabama.% a2 o1 T2 T; Z' g2 d; K
Address correspondence to: Samar K. Bhowmick, MD, FACE,$ B a5 O1 c! G$ n" m
Professor of Pediatrics, University of South Alabama, College of
9 C8 ^: M% Q! j3 q: F n2 ?5 IMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
" A! a& S. @1 R+ V' T8 ie-mail: [email protected].+ r5 s j. D, M/ G6 Q% ^ t4 D
about 6 to 7 months old, which progressively became
9 Y. b2 [5 z; S6 R! ^. n) W! ?darker. She was also concerned about the enlarge-
U+ G+ b n+ n Pment of his penis and frequent erections. The child A9 U4 W9 k3 J% P. a {
was the product of a full-term normal delivery, with
S* z; D! `( c8 ^( ka birth weight of 7 lb 14 oz, and birth length of
. n! j, Z" k, ?7 ^5 a* B20 inches. He was breast-fed throughout the first year& L( y5 y! Z" ]( h+ |8 s c
of life and was still receiving breast milk along with
, E" N( W) W. ~solid food. He had no hospitalizations or surgery,
7 _$ W% C4 X5 a* n5 L5 V" s3 u# ^and his psychosocial and psychomotor development
# g4 e+ i' R: [; b" [8 k2 a4 qwas age appropriate.
9 f7 y* N0 o! m" p$ X1 k8 `The family history was remarkable for the father,( A5 J4 h3 W/ C2 _+ F* Z
who was diagnosed with hypothyroidism at age 16,
/ | V7 r; T' x' J& s/ r/ X' Awhich was treated with thyroxine. The father’s5 K/ T+ I* i% W- G( I4 L4 m
height was 6 feet, and he went through a somewhat
+ u4 E2 a( _1 f; |% q. d6 Z, Pearly puberty and had stopped growing by age 14.
- D2 \0 q) ^6 Z: N4 y6 k, hThe father denied taking any other medication. The
) T; D6 w/ ]; _# b dchild’s mother was in good health. Her menarche
' }' P9 f& U/ ^4 O% w& _was at 11 years of age, and her height was at 5 feet
; w% C& G/ K* j% B. Y: ^7 T5 inches. There was no other family history of pre-0 f' L; }) w. G0 o
cocious sexual development in the first-degree rela-& w- z9 B: }, @2 {6 r/ _, B
tives. There were no siblings.1 H o8 J$ L6 L# F
Physical Examination
+ L9 |* B+ B! O& C/ Z, F' Q) i8 sThe physical examination revealed a very active,9 f$ ^4 s2 V" n) d" `7 z# Z
playful, and healthy boy. The vital signs documented6 j/ u6 x) w% h; y) y) i- R! C
a blood pressure of 85/50 mm Hg, his length was
3 [/ t1 L { s90 cm (>97th percentile), and his weight was 14.4 kg
) j1 l- Y5 ?9 R(also >97th percentile). The observed yearly growth
6 E! M6 f e2 z' q7 }6 l8 bvelocity was 30 cm (12 inches). The examination of
, o2 f" W- e7 K' |$ @- }the neck revealed no thyroid enlargement., Q$ A( [4 H8 l$ a4 y! `% X
The genitourinary examination was remarkable for. i( V, b6 S0 e. I0 a9 u
enlargement of the penis, with a stretched length of
5 f4 ^( V8 U( j9 T6 q1 a8 cm and a width of 2 cm. The glans penis was very well \0 w- G7 R6 e) L
developed. The pubic hair was Tanner II, mostly around7 j2 }' m" w# A! K. R9 j9 P, A
5402 P- b% a0 E) y3 v2 h3 s: J& s
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
8 Y( D9 X. z( x7 \- ~0 j0 Sthe base of the phallus and was dark and curled. The3 n5 N, }* A: A% D8 D8 X7 g# B
testicular volume was prepubertal at 2 mL each." E6 w4 ]5 p1 C, b2 t& F- d
The skin was moist and smooth and somewhat4 J3 W5 @3 i2 G! ^
oily. No axillary hair was noted. There were no
/ e. p% E3 U3 r; o* ?) c- Aabnormal skin pigmentations or café-au-lait spots.& a9 y |( n: H+ i
Neurologic evaluation showed deep tendon reflex 2+# H1 h! S$ s: @) W2 ]' k1 x
bilateral and symmetrical. There was no suggestion1 R: S: L/ K; I/ X+ L3 Q& t( o7 l
of papilledema.
" n- c( T" g' R- w# Q$ WLaboratory Evaluation% [3 B# \! F1 h+ Y, q
The bone age was consistent with 28 months by: y3 z9 w5 c# Y: ^, S; i) R
using the standard of Greulich and Pyle at a chrono-5 P2 l1 {3 L3 a
logic age of 16 months (advanced).5 Chromosomal4 }) I2 |/ S A
karyotype was 46XY. The thyroid function test
l( n) z% k Q% L& O0 U/ ]- J% u) b9 Oshowed a free T4 of 1.69 ng/dL, and thyroid stimu-
E4 S% ?9 e% f, x2 Llating hormone level was 1.3 µIU/mL (both normal).
8 L* a! W9 D. R9 NThe concentrations of serum electrolytes, blood/ p2 V& R3 w; j9 }. q$ r
urea nitrogen, creatinine, and calcium all were
3 H8 g( ?7 I+ \( Y" l9 [within normal range for his age. The concentration
6 i- U( G' j" s) ?; }of serum 17-hydroxyprogesterone was 16 ng/dL$ E; X% V" e5 n( g5 |9 o4 x
(normal, 3 to 90 ng/dL), androstenedione was 20
9 a: y8 I h( T4 @ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
7 r4 B- Q" ` j& ^terone was 38 ng/dL (normal, 50 to 760 ng/dL),
5 l/ @7 O0 Q. Z3 T, gdesoxycorticosterone was 4.3 ng/dL (normal, 7 to
3 K3 Y s; y- Y) {. o- s49ng/dL), 11-desoxycortisol (specific compound S)
+ y/ c, O7 r1 H7 p# h8 _was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-9 }+ o( p2 @# j3 _
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
+ i8 n; f# _1 o$ p6 ~testosterone was 60 ng/dL (normal <3 to 10 ng/dL),0 R# M6 W! k+ a' p: f! u1 }: E
and β-human chorionic gonadotropin was less than }+ _) U, }( z- c6 X
5 mIU/mL (normal <5 mIU/mL). Serum follicular$ F0 j+ r" [- w9 u3 Q6 s; `8 @' J7 o/ y
stimulating hormone and leuteinizing hormone
s! r4 J5 n8 s3 q5 [* t" c0 f Wconcentrations were less than 0.05 mIU/mL) V/ m8 T, P: a4 C
(prepubertal).; ^& y% ~' u' H+ m
The parents were notified about the laboratory
+ U4 C+ Y. W7 o' _7 xresults and were informed that all of the tests were
) f" e6 x1 @) n0 \; Wnormal except the testosterone level was high. The
1 [, n5 V& S. M K W B' @follow-up visit was arranged within a few weeks to
2 N7 X* \9 t0 w- `' B. \" v) xobtain testicular and abdominal sonograms; how-
* B% j% G: H) P- }7 G1 Lever, the family did not return for 4 months., n9 K/ f. k; L! k w
Physical examination at this time revealed that the
' {' R, ?2 i; T& _( P0 R+ i E( x/ ]child had grown 2.5 cm in 4 months and had gained
- K j8 r; i k; u$ R2 kg of weight. Physical examination remained7 y2 y" X5 @; |$ G# w
unchanged. Surprisingly, the pubic hair almost com-
, I7 ` Z6 Z( t: j0 Q! J/ {& \pletely disappeared except for a few vellous hairs at, Z" h/ W. `8 _9 T. p' x# `3 b% Z
the base of the phallus. Testicular volume was still 2
% K* ^ R6 J' M$ |: z6 c XmL, and the size of the penis remained unchanged.& B' R( ]8 ^/ I0 r8 U# b
The mother also said that the boy was no longer hav-8 ^/ [* i4 m& v) {+ _
ing frequent erections.( k% C# ^% M) X" Q' [, b
Both parents were again questioned about use of6 _7 }! L- M- P/ k0 r: @
any ointment/creams that they may have applied to
$ l7 p4 G" P3 H' x6 qthe child’s skin. This time the father admitted the( R9 r0 G8 W- Z+ f# T+ G+ M! A
Topical Testosterone Exposure / Bhowmick et al 541
# ~ Y6 U- F2 v* N" C( ]. e& ~use of testosterone gel twice daily that he was apply-9 N. |- t7 ^% t8 ]: N+ h
ing over his own shoulders, chest, and back area for {2 j% T- `: J7 z
a year. The father also revealed he was embarrassed* r9 l, I8 p; `
to disclose that he was using a testosterone gel pre-% u* w0 q( E7 e% e; K
scribed by his family physician for decreased libido' {% I6 m' o6 `6 {" f; Q
secondary to depression.5 {- k; |( ~, z
The child slept in the same bed with parents.6 p+ z" F% y- |4 z) j/ G: X/ a
The father would hug the baby and hold him on his
; p* Z% y" S. v. nchest for a considerable period of time, causing sig-! D! Q# e3 w$ j' g, t$ h, c5 H
nificant bare skin contact between baby and father.
& c* I3 W% z" m, AThe father also admitted that after the phone call,% K3 m0 P2 f! J e* m
when he learned the testosterone level in the baby
! I& M U4 c9 {2 Ewas high, he then read the product information8 n; [7 W9 [5 J' o: c
packet and concluded that it was most likely the rea-
3 o- G0 o& N& j i, i; A7 Rson for the child’s virilization. At that time, they
; w6 d' O. i' V# {- P1 Edecided to put the baby in a separate bed, and the1 {: e* Z7 n9 ^" R& l0 f2 T! [. Q
father was not hugging him with bare skin and had
" N! S& E$ H7 x$ c% y" c& Z6 C9 j1 Tbeen using protective clothing. A repeat testosterone F% E2 J: r- b i6 k* F9 w. c
test was ordered, but the family did not go to the
: r9 Y) w& w- I+ Wlaboratory to obtain the test.2 R. p; E. ^2 P v$ M1 P1 p7 W1 c3 P
Discussion
4 ?0 i1 r$ t# x: N5 M3 tPrecocious puberty in boys is defined as secondary4 X; z, C0 V7 Z# z) r
sexual development before 9 years of age.1,4
0 p% q# J- a) P- T4 HPrecocious puberty is termed as central (true) when' f6 k5 C9 @ Z" R
it is caused by the premature activation of hypo-
" q0 T8 T+ p3 d. X& Fthalamic pituitary gonadal axis. CPP is more com-
8 X8 Y* u' f" ~: v5 Emon in girls than in boys.1,3 Most boys with CPP! S5 z; p* V. |
may have a central nervous system lesion that is
$ ]# f2 `( T* f& U- J% @8 {responsible for the early activation of the hypothal-
' j! t; I# ~! K: f$ }! Y6 Qamic pituitary gonadal axis.1-3 Thus, greater empha-
/ |+ c( i9 h# ~sis has been given to neuroradiologic imaging in- U( h% [: g1 f. m$ c T
boys with precocious puberty. In addition to viril-
" l( j+ ~. l- R. t3 }% n9 mization, the clinical hallmark of CPP is the symmet-
7 u" O9 d2 {" x( A! d# Mrical testicular growth secondary to stimulation by
: ~! D9 i. v$ X6 W+ a( F$ T; H1 L# Vgonadotropins.1,35 ]# T& p% `- \9 `' w5 Y" ?( I
Gonadotropin-independent peripheral preco-9 X7 C' C( f8 _4 c y9 a) j
cious puberty in boys also results from inappropriate) @7 C& g: n' G
androgenic stimulation from either endogenous or: P/ m0 @& C; y/ i1 [ z! \& e
exogenous sources, nonpituitary gonadotropin stim-1 G- H- H. D; q* a5 o* f+ f
ulation, and rare activating mutations.3 Virilizing
9 |7 Y$ g, G* x* xcongenital adrenal hyperplasia producing excessive1 }; ? }7 s! j" ~
adrenal androgens is a common cause of precocious3 ]! t3 m6 D7 T% \$ f% x* L8 T
puberty in boys.3,4
2 ]/ h, c3 x9 @9 J. m, ?The most common form of congenital adrenal
0 j+ g" h0 D) Nhyperplasia is the 21-hydroxylase enzyme deficiency.
; u6 n/ D8 x( }+ r/ s; d. }- x7 DThe 11-β hydroxylase deficiency may also result in1 R ?' W6 W# i7 R
excessive adrenal androgen production, and rarely,
$ m3 y( {7 s) |2 Tan adrenal tumor may also cause adrenal androgen
/ e/ a3 L) a: i& |excess.1,3
6 l, A! v% T3 I9 ^6 J1 bat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from9 _7 Z' [/ Q! R3 J3 I
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007: O. P$ P, b0 `1 h+ o
A unique entity of male-limited gonadotropin-+ W( C; C! k1 ?' l/ u0 K
independent precocious puberty, which is also known- X. ~% G0 j9 t7 C: f! K/ A, V: ^8 I
as testotoxicosis, may cause precocious puberty at a
. f: g5 `8 V3 R3 b0 O- }very young age. The physical findings in these boys
2 ~$ Q; g+ C+ i- @0 Y, [with this disorder are full pubertal development,
' Z. |9 Q" X, R0 Bincluding bilateral testicular growth, similar to boys1 {/ i3 O% @6 Q/ P o
with CPP. The gonadotropin levels in this disorder
; B& f+ a6 u3 X+ t- \are suppressed to prepubertal levels and do not show, M7 y3 z- {, k7 [( j* e* O- T
pubertal response of gonadotropin after gonadotropin-6 z+ y' G* g! A# P& b N% ]
releasing hormone stimulation. This is a sex-linked8 k! A% _( u- u! Y3 S3 C" m8 y5 m% V
autosomal dominant disorder that affects only
" S3 |$ j, O0 p& f% ?- m/ n" Qmales; therefore, other male members of the family( w0 B/ ^- r+ m
may have similar precocious puberty.3
4 H1 m0 ]- ^/ ~/ J% BIn our patient, physical examination was incon-! x' g: ^5 D6 N$ \% q
sistent with true precocious puberty since his testi-
* Q2 ~2 ?- m& L# b4 vcles were prepubertal in size. However, testotoxicosis" c# C9 W4 c) `/ g( w; a; R8 n$ l
was in the differential diagnosis because his father
+ ^6 a* R5 |/ E4 fstarted puberty somewhat early, and occasionally," S- f) G' N" o Z( s
testicular enlargement is not that evident in the
! W% k& R' ~& y9 @0 J# i! g9 Pbeginning of this process.1 In the absence of a neg-8 g6 K& \! J# Y4 E% G
ative initial history of androgen exposure, our
; j* E+ g e5 |% _* fbiggest concern was virilizing adrenal hyperplasia,
; ]* c* n, Z4 Y! p- l. [: N! j* p- ^either 21-hydroxylase deficiency or 11-β hydroxylase0 X; h( J9 J" P& D# r
deficiency. Those diagnoses were excluded by find-
& i* [& a+ ^! }# E$ V' z1 Sing the normal level of adrenal steroids.
3 r, @/ v: k: t: YThe diagnosis of exogenous androgens was strongly: E4 S- U* d) O4 N9 `5 b
suspected in a follow-up visit after 4 months because. }( p* q V1 N
the physical examination revealed the complete disap-# `0 W- v4 V; q3 n
pearance of pubic hair, normal growth velocity, and: O. N% J' c$ d& j9 C1 b0 z- Z: m
decreased erections. The father admitted using a testos-
1 S/ E7 `( i! ~/ C3 s% Q; uterone gel, which he concealed at first visit. He was0 ?; `" N7 Q! Q) w
using it rather frequently, twice a day. The Physicians’! l X9 X9 l5 {; M- u
Desk Reference, or package insert of this product, gel or
+ ^2 b; ^& {3 r2 h' kcream, cautions about dermal testosterone transfer to
. I6 s( d1 Q( w: z! ounprotected females through direct skin exposure.2 P& V7 e7 m- H7 f, ?, Y$ z$ f0 |
Serum testosterone level was found to be 2 times the
! t( V. h0 T& N' b9 Sbaseline value in those females who were exposed to5 v% T. A4 X. l3 [, Q
even 15 minutes of direct skin contact with their male0 |3 w9 _# F/ ` ^" R2 o
partners.6 However, when a shirt covered the applica-
& _4 z# F& F4 ^( O' O2 ltion site, this testosterone transfer was prevented.! X# i! U' L" k1 W, u
Our patient’s testosterone level was 60 ng/mL,+ Z/ D! V3 n5 L$ K1 q( H
which was clearly high. Some studies suggest that
6 {7 j; F. E3 Y5 mdermal conversion of testosterone to dihydrotestos-5 r N' p% s) ~/ N; W
terone, which is a more potent metabolite, is more
9 A0 W. c* R: l" d( @8 factive in young children exposed to testosterone6 u) w( U7 n. A8 I. N. V
exogenously7; however, we did not measure a dihy-
) [& [; @0 H; h( P. j7 Fdrotestosterone level in our patient. In addition to; o& q3 X6 I1 |
virilization, exposure to exogenous testosterone in; j6 w# B, ~/ E& v3 o
children results in an increase in growth velocity and$ C/ e, A' \# o* a
advanced bone age, as seen in our patient.
! [1 h' G J% Y; F6 W8 x1 [The long-term effect of androgen exposure during
; @! i4 e3 V l4 C6 ?6 }3 jearly childhood on pubertal development and final
$ J; _* E a x z: p9 Z' A8 Y* Madult height are not fully known and always remain' x$ Z9 O; E. a: b! g2 b+ Z
a concern. Children treated with short-term testos-
K. N1 H* q" b# H3 T& eterone injection or topical androgen may exhibit some5 m' f6 i$ o5 L O
acceleration of the skeletal maturation; however, after9 [+ O2 _+ v! c' i$ {. ]3 x8 e
cessation of treatment, the rate of bone maturation1 o! w6 p0 T5 x/ k9 v3 r5 r# E/ z( ]! F
decelerates and gradually returns to normal.8,99 a0 F7 M7 }3 F4 s
There are conflicting reports and controversy
9 _4 e( Y3 D ~/ gover the effect of early androgen exposure on adult
e) A& E+ E; l' Fpenile length.10,11 Some reports suggest subnormal+ f1 n" W- k& \" E9 X
adult penile length, apparently because of downreg-3 u. I4 z8 v; W
ulation of androgen receptor number.10,12 However,, x% s; h& s1 e! L. n( R
Sutherland et al13 did not find a correlation between
6 } n2 p4 o6 I( s% zchildhood testosterone exposure and reduced adult" H+ Z. T# R! h4 [
penile length in clinical studies.& T2 u% j% Y# b) ], V1 b, C. s4 V
Nonetheless, we do not believe our patient is5 b3 w2 U2 a+ B9 K
going to experience any of the untoward effects from
8 Y E0 a% A' e& U0 ttestosterone exposure as mentioned earlier because
' \( `* v' Q9 L8 o# Hthe exposure was not for a prolonged period of time.
$ c8 M( ~; z! VAlthough the bone age was advanced at the time of" K" H/ J" f' {" c+ \! |1 t
diagnosis, the child had a normal growth velocity at
1 |1 T/ D4 C+ E: r8 mthe follow-up visit. It is hoped that his final adult- A& C, ~- h. p5 z
height will not be affected.7 S8 N0 t. l. Y/ E2 h# n
Although rarely reported, the widespread avail-$ ~, V3 Q; `. n, F: `
ability of androgen products in our society may. z- L4 Z" r; h5 G$ y& i$ ^
indeed cause more virilization in male or female
4 _" o$ W' p& {$ V- o7 ~children than one would realize. Exposure to andro-
' s5 ]6 R0 ?3 v6 F$ {" v, P T$ A' r" Jgen products must be considered and specific ques-
: {7 k% [$ e$ y/ ]" Q1 N* d, {2 wtioning about the use of a testosterone product or& B0 C$ l5 G* ~5 `# l) U) J
gel should be asked of the family members during. t/ `$ h J7 t- c( _, V3 |
the evaluation of any children who present with vir-; {8 f* p+ e% O. x. B/ W
ilization or peripheral precocious puberty. The diag-
$ E7 g& e" j' H+ Mnosis can be established by just a few tests and by* W6 [5 g" U2 y: z# X* q' D2 w+ k
appropriate history. The inability to obtain such a, o8 U+ Y+ W8 { h
history, or failure to ask the specific questions, may, C6 [0 E4 F* V+ u) r! V) ~
result in extensive, unnecessary, and expensive
7 e9 M0 }" P8 ^; `0 E$ winvestigation. The primary care physician should be2 S( h+ S* s) s% F
aware of this fact, because most of these children) a) B, i2 t1 h' s
may initially present in their practice. The Physicians’
# |9 [& _. {) g* W& Y5 ODesk Reference and package insert should also put a
& b+ A# L$ E$ ~7 G Qwarning about the virilizing effect on a male or8 \2 K7 ?! y) d1 d
female child who might come in contact with some-
; }; [/ ~$ C9 }5 O2 o! D pone using any of these products.% G, ?; p4 ^ P/ t- [, O7 p
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) t3 _7 Z5 Q# XDekker Inc; 2003:211-238.
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exposure to testosterone. Pediatrics. 1999;104:e23.1 n8 }' |6 F2 Z# R7 g
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6 u/ P; ?: p+ X, z1 ~Stanford, CA: Stanford University Press; 1959.
3 U' V1 v4 f* G4 b8 o/ b6. Physicians’ Desk Reference. Androgel 1% testosterone,
2 V& |6 s2 U# u. T1 _. {* ^& ]! o1 yUnimed Pharmaceutical Inc. Montvale, NJ: Medical
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