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is a significant concern for physicians. Central: [- W* V; ^7 s2 `4 n, C
precocious puberty (CPP), which is mediated4 q, K% z6 ]; ]6 `" z' P: b
through the hypothalamic pituitary gonadal axis, has4 u, Y K3 G& D( I
a higher incidence of organic central nervous system* ^" B. \2 E3 R# F% L3 \8 K
lesions in boys.1,2 Virilization in boys, as manifested
+ Z% f$ L2 c9 _; Oby enlargement of the penis, development of pubic
1 a! ]" {+ a+ b6 M& c! h( {hair, and facial acne without enlargement of testi-
- a6 G% b9 O Q+ U- z8 N' Ncles, suggests peripheral or pseudopuberty.1-3 We: W" ]. _( v3 ~" @
report a 16-month-old boy who presented with the
/ m+ \/ M1 S# I+ |$ V5 L' ` i+ e6 Denlargement of the phallus and pubic hair develop-
* f; w' a" l6 E& P5 hment without testicular enlargement, which was due
4 S' O+ U3 F- c! ]+ fto the unintentional exposure to androgen gel used by5 \4 y6 @7 C( R. ~5 n2 N
the father. The family initially concealed this infor-
' Z, A$ r7 z) W6 Imation, resulting in an extensive work-up for this
( I0 I. E2 `1 o! n1 T$ B7 M% |3 `, \child. Given the widespread and easy availability of5 a8 t: {8 p& K: @/ K* L
testosterone gel and cream, we believe this is proba-, X$ U0 h$ ?6 L
bly more common than the rare case report in the5 Z' H8 i( _7 Q9 B
literature.4
( Q# C& g/ J1 f7 [5 H5 j2 tPatient Report
6 Z- O1 S/ L, {% ]4 m6 |/ E/ pA 16-month-old white child was referred to the
& |4 }" \" x, k4 mendocrine clinic by his pediatrician with the concern; X3 Q- C/ Q1 ~1 D
of early sexual development. His mother noticed3 C) e" D; S* [1 C# N% R! v
light colored pubic hair development when he was
6 Q* t( `0 P- F+ T+ Q/ M0 bFrom the 1Division of Pediatric Endocrinology, 2University of2 L& [0 j8 J. d# A/ Z% Q; w! C
South Alabama Medical Center, Mobile, Alabama., b& P$ h/ w6 ~! b7 Z! b
Address correspondence to: Samar K. Bhowmick, MD, FACE,
8 u% |5 f: ^" e8 H, b) h1 FProfessor of Pediatrics, University of South Alabama, College of
( z% A; P& p1 H; L) m. |+ _Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
) e# S) T9 Q) s/ F: [! W3 T2 De-mail: [email protected].
% D. p+ }6 B% s. tabout 6 to 7 months old, which progressively became
( E& q" w- D, g: o% E& ndarker. She was also concerned about the enlarge-' A" L- W" S7 p; H7 N9 C2 S# s( \
ment of his penis and frequent erections. The child
4 X5 b6 d! o/ lwas the product of a full-term normal delivery, with+ D% E! d6 p! l" V+ V0 p# c+ g$ H* ^
a birth weight of 7 lb 14 oz, and birth length of
" g- f; }- O4 B( q20 inches. He was breast-fed throughout the first year
+ `' I% d/ l$ ~4 E* b$ Rof life and was still receiving breast milk along with/ M" S) p+ \( F7 |7 g
solid food. He had no hospitalizations or surgery,8 ?# n1 D; l8 j/ i, t9 _
and his psychosocial and psychomotor development
7 d+ k) y7 U7 q9 e+ @' K q2 h# G% Wwas age appropriate.2 z, c c+ w% H) Y* K/ A8 ?
The family history was remarkable for the father,9 A y% N+ ~- I$ g- T& D5 R, j/ x
who was diagnosed with hypothyroidism at age 16,
+ |+ r ~" A P8 ^8 m9 Fwhich was treated with thyroxine. The father’s* H7 {- D u5 ?5 [, S0 ]
height was 6 feet, and he went through a somewhat1 o0 N) O o, ^% y3 p q- Q$ h+ s
early puberty and had stopped growing by age 14.5 P: e z/ `/ d/ n* a: m
The father denied taking any other medication. The
; f c1 v L2 [! H: T0 N9 A4 s3 hchild’s mother was in good health. Her menarche
* v3 _( L0 t6 \- d8 _( J1 ~was at 11 years of age, and her height was at 5 feet8 S, |& `' z9 b* ]( c. X
5 inches. There was no other family history of pre-
; s# |% q; I; R0 u0 ncocious sexual development in the first-degree rela-
% O9 T/ E" W8 `0 b4 {! ptives. There were no siblings.
5 T) b# d5 J% {1 T: Y" tPhysical Examination
. q9 t& F7 f/ o" c3 R& g: rThe physical examination revealed a very active,6 P" H% C9 v5 u. p
playful, and healthy boy. The vital signs documented+ `* f( g- g, N% G* b
a blood pressure of 85/50 mm Hg, his length was6 A1 a- ]5 ]% c$ }+ q
90 cm (>97th percentile), and his weight was 14.4 kg
' {5 Y2 Z( D7 k(also >97th percentile). The observed yearly growth1 Z% F9 v4 U( T! { q$ G
velocity was 30 cm (12 inches). The examination of
: Y1 k1 o- P2 O/ ~% bthe neck revealed no thyroid enlargement.+ `7 P6 Y+ Y: O5 N/ z. l6 c* f
The genitourinary examination was remarkable for# j# e) |( ] K; T
enlargement of the penis, with a stretched length of
5 \/ G# T* `% c- x8 cm and a width of 2 cm. The glans penis was very well8 X; S4 j& K: `7 P) J
developed. The pubic hair was Tanner II, mostly around
6 D. T& S7 Y4 x9 h: s# b0 P5401 _3 S- ^# ? h: U
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from% {9 k) y; ~2 g6 r
the base of the phallus and was dark and curled. The; {. u. I0 {. ~6 R, ?8 ~
testicular volume was prepubertal at 2 mL each.' F! W- j5 I- ?1 r% n1 U& g
The skin was moist and smooth and somewhat# @ t5 |, _2 ?7 t2 J5 Y: ^
oily. No axillary hair was noted. There were no4 U5 u* s* ]* z
abnormal skin pigmentations or café-au-lait spots.
2 D& X! ~) \7 [' Q3 R, YNeurologic evaluation showed deep tendon reflex 2+; |. i0 b) p& U. i$ [/ j
bilateral and symmetrical. There was no suggestion
8 _5 m: n# u" z% cof papilledema.! o) ^4 K7 X) e8 d# q& i
Laboratory Evaluation
2 y4 q9 Z ^- U9 z+ z* a' A+ `The bone age was consistent with 28 months by+ C4 v( H# Q. C! z5 a j
using the standard of Greulich and Pyle at a chrono-' w e% S% }/ r! U$ ~; y
logic age of 16 months (advanced).5 Chromosomal
! ^% r0 V# N/ V9 P% e5 i7 M, b- Kkaryotype was 46XY. The thyroid function test
( o7 d2 c3 Q5 \6 M3 `showed a free T4 of 1.69 ng/dL, and thyroid stimu-
) [/ }4 t% U- @9 mlating hormone level was 1.3 µIU/mL (both normal).
8 c+ d& z4 M0 V# ^) QThe concentrations of serum electrolytes, blood
1 P) V# @, g* w% A4 s1 Y% rurea nitrogen, creatinine, and calcium all were: Y3 \- ~. x1 V1 d
within normal range for his age. The concentration3 ^1 i9 o7 W6 V. o; U3 l
of serum 17-hydroxyprogesterone was 16 ng/dL+ j* y, z, A2 |' q
(normal, 3 to 90 ng/dL), androstenedione was 206 v; h+ H, X. F6 n: F- U
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-7 `* L) ~ f" w/ o! E
terone was 38 ng/dL (normal, 50 to 760 ng/dL),2 Z% b6 P/ x0 |3 H5 K4 h2 a& \
desoxycorticosterone was 4.3 ng/dL (normal, 7 to$ Q8 R# `# ?- r7 x6 H8 |$ u% B% V
49ng/dL), 11-desoxycortisol (specific compound S)
" v. J* O- k/ U9 L) dwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-9 _; U: q1 ~ e" ~
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total. P/ a9 }, L8 n! X7 }3 T+ S
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),, C+ q! i( c0 V7 l% ^
and β-human chorionic gonadotropin was less than
" [9 X! D9 G9 n. X5 mIU/mL (normal <5 mIU/mL). Serum follicular1 h( V$ E( Q0 y
stimulating hormone and leuteinizing hormone1 q ^) Y$ B; I4 G, P- E
concentrations were less than 0.05 mIU/mL
$ d I2 t' o5 x/ \- t' ](prepubertal). r6 w5 L. t' B; s/ A3 B
The parents were notified about the laboratory
. X7 h4 F0 d9 _% M( n- ~results and were informed that all of the tests were* \3 H9 \5 s$ \2 g9 {
normal except the testosterone level was high. The
* r2 k6 d/ U5 C# k" d4 f0 O# Ofollow-up visit was arranged within a few weeks to5 l, ?$ s' h8 v* }/ ^
obtain testicular and abdominal sonograms; how-
: A* C2 h) e1 P4 l# t9 a% Wever, the family did not return for 4 months.
{8 Q$ L$ ?. E' ~Physical examination at this time revealed that the/ h( ~* q% V6 N+ t3 b
child had grown 2.5 cm in 4 months and had gained5 H# e9 M& F; o9 p
2 kg of weight. Physical examination remained
+ _2 Q' k Z* g/ v8 V8 [unchanged. Surprisingly, the pubic hair almost com-9 q7 c8 H5 V, `) l9 I
pletely disappeared except for a few vellous hairs at- x- _' e) V# @4 d6 v* z
the base of the phallus. Testicular volume was still 2, O3 I7 K2 |7 H( t- Z7 Z
mL, and the size of the penis remained unchanged." ]8 V5 f" x0 `9 c
The mother also said that the boy was no longer hav-8 |( v6 c3 V. v2 J5 O3 A5 j
ing frequent erections.( u8 p Z5 P( k" V2 o/ f- F3 q7 o
Both parents were again questioned about use of7 v0 F6 n8 ~( D# h
any ointment/creams that they may have applied to; w/ ~( E- o" q# R$ W3 `; G
the child’s skin. This time the father admitted the% L F4 ?. E; z" ^
Topical Testosterone Exposure / Bhowmick et al 541* L! O, |7 D; u3 ?" L5 b: Y4 |6 |8 m
use of testosterone gel twice daily that he was apply-
7 L+ E( G1 H! L* y& p" King over his own shoulders, chest, and back area for
L6 g1 Y0 B- X8 e. p/ da year. The father also revealed he was embarrassed
; B0 b' ]' d9 O3 t5 C2 Kto disclose that he was using a testosterone gel pre-
9 T3 J1 R" m3 [/ T# j1 rscribed by his family physician for decreased libido U+ o' [) ^" }0 z" K* o4 G1 E6 o
secondary to depression.
" M, Q9 f9 g) v0 D" I# }3 pThe child slept in the same bed with parents.9 W5 r' J9 N% C. h* ^5 x' [' D) A
The father would hug the baby and hold him on his
) M( v7 u0 b. y5 ^; Tchest for a considerable period of time, causing sig-2 @ u9 [3 r) K7 N
nificant bare skin contact between baby and father.
# }0 A( H+ q1 M2 w0 YThe father also admitted that after the phone call,
M& \- E* f/ R* t4 Q {when he learned the testosterone level in the baby
& R$ p* q& F Q$ w3 owas high, he then read the product information
, Y# r# N. v# t, |+ lpacket and concluded that it was most likely the rea-5 v4 u) u+ \2 I, n- E7 `& H: _
son for the child’s virilization. At that time, they8 t! o2 v( Y9 u( i; d, b( b
decided to put the baby in a separate bed, and the
, ]# B- e7 J ^5 _. zfather was not hugging him with bare skin and had
9 d2 c; O; U; D; x9 F) a* jbeen using protective clothing. A repeat testosterone
% P! S3 A/ \6 n2 q4 e* g7 G. z$ qtest was ordered, but the family did not go to the
% ~/ _0 F! p/ o1 R9 [& L1 J: ylaboratory to obtain the test.1 `0 H; |: v& T$ W% Y/ B$ n
Discussion
; v3 f7 j* c* q: X0 T7 q. dPrecocious puberty in boys is defined as secondary
7 E% y7 o' j7 ^# e r) Asexual development before 9 years of age.1,43 D: s% A, U) x' |5 [
Precocious puberty is termed as central (true) when0 g1 |5 N7 Y/ r# n5 h0 ^* C
it is caused by the premature activation of hypo-
; N J, [7 G+ G& R0 J! U% othalamic pituitary gonadal axis. CPP is more com-
0 O" z5 E- a6 {, ^" K% g0 Zmon in girls than in boys.1,3 Most boys with CPP* T; Z' m. q# q5 L7 |" @# y9 x
may have a central nervous system lesion that is
. C% z% b7 o! P; Lresponsible for the early activation of the hypothal-
6 m9 E4 k% z: d. d' z; {amic pituitary gonadal axis.1-3 Thus, greater empha-
- M7 r& U0 E5 n- Csis has been given to neuroradiologic imaging in4 `" K4 f8 X; }. _# T8 f$ O) H
boys with precocious puberty. In addition to viril-1 _7 u7 |; Q) s7 a" R2 y
ization, the clinical hallmark of CPP is the symmet-
& O+ }( o+ b6 q- P1 f% }6 L2 erical testicular growth secondary to stimulation by% n( Y C4 ]+ ` v4 D1 ]' X
gonadotropins.1,3
1 l8 O. |% J2 R: v6 [3 d VGonadotropin-independent peripheral preco-; ]0 e* B% Y6 Q; i: l' I
cious puberty in boys also results from inappropriate
, t9 ]2 w: b' N+ Z) n) Candrogenic stimulation from either endogenous or
; M4 {3 Y) I- O4 x% iexogenous sources, nonpituitary gonadotropin stim-
7 D7 H: y4 T# |/ B/ Pulation, and rare activating mutations.3 Virilizing: N1 R0 l6 a R' L2 M
congenital adrenal hyperplasia producing excessive0 g! `: T: p; i& x% e: b4 X, r |
adrenal androgens is a common cause of precocious
( v1 B2 q' [2 l5 `* Spuberty in boys.3,4) A+ ~4 I( l1 \2 {( N# C
The most common form of congenital adrenal
0 _/ w, G% l9 v& b6 |hyperplasia is the 21-hydroxylase enzyme deficiency.
T# `. L4 G/ K; Z) dThe 11-β hydroxylase deficiency may also result in
5 e3 H9 l* g8 Xexcessive adrenal androgen production, and rarely,& w! k% Q! U* `! ]8 c/ o" ?, Y
an adrenal tumor may also cause adrenal androgen
& }1 l: ?' x6 p4 d4 hexcess.1,3( q8 {+ T/ D: E4 u
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542 Clinical Pediatrics / Vol. 46, No. 6, July 2007" S" q* D) Y( U- o8 ] t4 N
A unique entity of male-limited gonadotropin-3 i: X7 C. p# a3 Q6 K& u+ N
independent precocious puberty, which is also known
6 p' D$ I0 S z+ {) Uas testotoxicosis, may cause precocious puberty at a9 b( e9 }' z' e* r
very young age. The physical findings in these boys
& q* X6 G6 | _2 ~5 |' qwith this disorder are full pubertal development,
3 z, O6 z% o9 m) r# `: V9 }including bilateral testicular growth, similar to boys
' O$ J7 a: W$ h3 s2 fwith CPP. The gonadotropin levels in this disorder
7 m: k' I, _9 E( Xare suppressed to prepubertal levels and do not show
5 b6 C! X- T* P2 V% e. apubertal response of gonadotropin after gonadotropin-: q$ Z% B+ ]2 M' M$ o0 N m
releasing hormone stimulation. This is a sex-linked+ X, w) N) N _: E5 g
autosomal dominant disorder that affects only0 _4 E5 m; a8 w& S9 O+ X
males; therefore, other male members of the family
! X, s- X, v% | Z3 Tmay have similar precocious puberty.3
) e: ?( j1 _6 O3 A& W. OIn our patient, physical examination was incon-
' F, c: ~# k# Zsistent with true precocious puberty since his testi-
* R0 L! b$ g' K4 O$ B8 mcles were prepubertal in size. However, testotoxicosis8 ]) t* w6 \& I2 J, q
was in the differential diagnosis because his father
& J5 y9 _/ z6 H; ]5 jstarted puberty somewhat early, and occasionally,
' x U5 @! @- Mtesticular enlargement is not that evident in the
: T: `" x1 }1 A' ubeginning of this process.1 In the absence of a neg-
8 c) t4 h+ d# vative initial history of androgen exposure, our9 e, z4 F" Z0 m4 _; T
biggest concern was virilizing adrenal hyperplasia,
f' l/ Y3 r4 K$ o( keither 21-hydroxylase deficiency or 11-β hydroxylase2 O1 M' ~/ L1 T% E1 ]
deficiency. Those diagnoses were excluded by find-
: O# ^0 {5 _. e x8 |( b8 {ing the normal level of adrenal steroids.
( F) `8 w- E& V+ f+ h- hThe diagnosis of exogenous androgens was strongly4 ^% t7 g/ d6 Q7 Q( Y
suspected in a follow-up visit after 4 months because& a( Y) ~# |0 }2 @% E
the physical examination revealed the complete disap-
" @4 y; E: N! I* m6 g8 L/ Jpearance of pubic hair, normal growth velocity, and
1 k6 O9 o* N9 c( x$ xdecreased erections. The father admitted using a testos-& |& m- G0 {' K2 Q8 O
terone gel, which he concealed at first visit. He was
d4 _; f6 _2 ]; cusing it rather frequently, twice a day. The Physicians’
( g) z4 c) B) `' @# \" i8 gDesk Reference, or package insert of this product, gel or4 K( ~$ M" I* i
cream, cautions about dermal testosterone transfer to( n" b: `; _8 s# u) o* f# [
unprotected females through direct skin exposure.
7 w G: e' Y; \! T" p7 U" BSerum testosterone level was found to be 2 times the: O3 g/ A2 @3 |+ Y8 t
baseline value in those females who were exposed to
" n4 R+ L& d9 }even 15 minutes of direct skin contact with their male
% B! `! }& B" O6 lpartners.6 However, when a shirt covered the applica-7 U- w: U% I3 D: }5 B! ~$ g" h
tion site, this testosterone transfer was prevented.9 ]0 A3 @5 v# G$ C) F
Our patient’s testosterone level was 60 ng/mL,
" d1 M' r) `8 Z2 G1 Jwhich was clearly high. Some studies suggest that1 n, C. q2 w+ `( g
dermal conversion of testosterone to dihydrotestos-. D- ?$ w2 c/ Q& t
terone, which is a more potent metabolite, is more1 F/ m: m6 ^$ M- q/ u3 k4 H2 J
active in young children exposed to testosterone( v! p3 \: C. o% `. j& S
exogenously7; however, we did not measure a dihy-4 D8 J9 Z/ M6 g
drotestosterone level in our patient. In addition to9 @# u- |# n* F
virilization, exposure to exogenous testosterone in
, m+ F9 s# c5 }* n8 [2 [( _2 vchildren results in an increase in growth velocity and
) w6 P$ j4 S! l$ v& C7 Hadvanced bone age, as seen in our patient.! a& q' [$ M5 V6 t0 g/ D9 Y
The long-term effect of androgen exposure during
& H8 D, m' B$ Y% o, Xearly childhood on pubertal development and final
+ r) W' P! |) ]adult height are not fully known and always remain( o& K7 X+ }% K: O8 L
a concern. Children treated with short-term testos-
) m! x2 b" S$ H) y2 v3 Z2 Y* P7 Lterone injection or topical androgen may exhibit some
T! S6 e6 N& F) Cacceleration of the skeletal maturation; however, after
! X7 O s" Z. v8 X& D scessation of treatment, the rate of bone maturation
& L" ~ I. }! x; xdecelerates and gradually returns to normal.8,9% a L$ a; I3 x9 O3 e) o) M; b
There are conflicting reports and controversy1 w# B3 \7 t' U- |5 e$ m% E; M* f
over the effect of early androgen exposure on adult
+ ?/ s T* R5 \$ L; b# c6 \' Qpenile length.10,11 Some reports suggest subnormal
4 f) } e4 r! a& Eadult penile length, apparently because of downreg-
/ j1 E" \4 b: w) C0 G, a( o. m! q* [ulation of androgen receptor number.10,12 However,4 l, h* ~& Y5 \$ f9 Z: U1 G
Sutherland et al13 did not find a correlation between
" k5 j9 \( ]1 i0 y+ g5 l6 Y' Zchildhood testosterone exposure and reduced adult2 {' t& b1 K- G) _3 m
penile length in clinical studies.: \7 C/ p& r) c& s
Nonetheless, we do not believe our patient is+ e% k3 _+ |9 k6 W* a" Q
going to experience any of the untoward effects from
( c# a/ W0 O# i1 a8 s2 G Ltestosterone exposure as mentioned earlier because# |4 Z- b/ v7 G
the exposure was not for a prolonged period of time.; N! e2 W0 H" O1 f
Although the bone age was advanced at the time of
& |7 d* B- V: C8 E8 B! k2 Sdiagnosis, the child had a normal growth velocity at
+ @2 o- t, ^4 |5 R* r8 Bthe follow-up visit. It is hoped that his final adult" \9 ]0 }) \. e: f+ M4 ^3 G/ T( N X
height will not be affected.4 a& N& L2 I6 ^/ C, y/ A: k5 ?
Although rarely reported, the widespread avail-0 ~; v* p( k( b& p0 V$ Y/ w2 R0 E
ability of androgen products in our society may
4 T% y( q' t6 T- d6 X7 Tindeed cause more virilization in male or female
" Y8 W8 ^0 w# G4 `4 uchildren than one would realize. Exposure to andro-9 h+ `+ g! g- G7 @
gen products must be considered and specific ques-1 I" h& S7 Z) ^! _/ U! Y, g
tioning about the use of a testosterone product or
' D+ N) p3 b; T7 o- J: Tgel should be asked of the family members during# S+ l9 `: [( D& H/ {
the evaluation of any children who present with vir-
2 ^6 S3 M4 l: nilization or peripheral precocious puberty. The diag-
( ^1 j7 o2 c) \( Ynosis can be established by just a few tests and by2 u" f2 ?7 a, n }; L% k% \
appropriate history. The inability to obtain such a
) l* b" u3 E- Hhistory, or failure to ask the specific questions, may; y! Z9 {/ i9 \5 H8 F
result in extensive, unnecessary, and expensive/ Z( m( Q5 B! G( Q1 L9 I- i
investigation. The primary care physician should be
& D" ?: E: N. C7 Uaware of this fact, because most of these children
+ Y: i9 T( a- _! wmay initially present in their practice. The Physicians’0 m0 K( [, P6 Q; q' N
Desk Reference and package insert should also put a
3 C q" Z1 B3 N9 v3 vwarning about the virilizing effect on a male or
$ g6 A+ @+ c' }) Qfemale child who might come in contact with some-& e0 |9 U) w- p ~3 d
one using any of these products. s7 q. Y6 k1 X1 O+ `
References
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Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;
* H Z. g3 \6 ^) [0 t2002: 565-628./ j' P; m r9 b- b0 B( J9 y" M
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puberty in children with tumours of the suprasellar pineal
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Topical Testosterone Exposure / Bhowmick et al 543
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Skeletal Development of the Hand and Wrist. 2nd ed.
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6. Physicians’ Desk Reference. Androgel 1% testosterone,, I" F9 O: M! a, @# f/ o6 `
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Economics Company, Inc; 2004:3239-3241., m. S1 P u* I
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