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is a significant concern for physicians. Central
3 {9 g: i: M# D5 q7 Y$ _% K5 zprecocious puberty (CPP), which is mediated
2 I# F4 ^: E* S) T: cthrough the hypothalamic pituitary gonadal axis, has
* {- `7 s O" ea higher incidence of organic central nervous system
& U7 P/ g& [) q1 N" g4 blesions in boys.1,2 Virilization in boys, as manifested
$ E2 K2 Y* t& r1 y3 Hby enlargement of the penis, development of pubic$ U6 `* Z% G5 b* B( Z
hair, and facial acne without enlargement of testi-
O1 u, o2 ~# L. n5 Z/ ^' O0 dcles, suggests peripheral or pseudopuberty.1-3 We
1 C, v' f' b' |" h% X! treport a 16-month-old boy who presented with the8 C( E7 v3 f, i: O9 d
enlargement of the phallus and pubic hair develop-
4 @; h4 F. P+ K$ b$ ?& _0 I/ qment without testicular enlargement, which was due* V6 k1 l- {9 r# x3 x$ J% l
to the unintentional exposure to androgen gel used by0 a( {) p$ `2 Q
the father. The family initially concealed this infor-
* E* e3 p! J& D6 e$ Y2 }/ A/ `mation, resulting in an extensive work-up for this
9 z2 ^5 c0 H! f( A& ~, ?child. Given the widespread and easy availability of- ~( T/ s" h8 C/ c# c8 B7 p" |# \) i. u
testosterone gel and cream, we believe this is proba-- C3 J: j. _1 S/ U# q. t8 T4 H
bly more common than the rare case report in the
4 _- v* O+ t: sliterature.4
8 ^8 b( J9 ?* b q$ D0 R+ K- h* z8 {& X! w" @Patient Report
* O6 U a9 C }" U) m, tA 16-month-old white child was referred to the
. R. I7 y0 s2 @# C! r6 [) ^4 Oendocrine clinic by his pediatrician with the concern0 I) ]8 ]( a3 R" w
of early sexual development. His mother noticed
7 O) j+ V! M) I) J( q+ x* Rlight colored pubic hair development when he was1 I" B& `, f* B& A( r0 K
From the 1Division of Pediatric Endocrinology, 2University of
! Q7 R6 [/ d/ v) @' DSouth Alabama Medical Center, Mobile, Alabama.# ~) F% F( l, q2 S) p! l# Y
Address correspondence to: Samar K. Bhowmick, MD, FACE,$ M- c' r. |! \. B: m* I
Professor of Pediatrics, University of South Alabama, College of. ]* u4 y( O% w W
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
. b% ~! M/ t' ?e-mail: [email protected].0 b& j2 ^# G7 c ^$ T+ G
about 6 to 7 months old, which progressively became
5 C5 A) P' r/ d7 Edarker. She was also concerned about the enlarge-
' Y: z0 L/ |5 T' O3 k, K! n+ F2 a# oment of his penis and frequent erections. The child, \+ k. \* u$ A* R, l' r1 [" R1 a: P$ ~
was the product of a full-term normal delivery, with1 S) H P: X( j7 h- F0 K: R
a birth weight of 7 lb 14 oz, and birth length of. S; ]+ D/ |& K4 e; e* T
20 inches. He was breast-fed throughout the first year
: e2 [: v0 @6 b. \of life and was still receiving breast milk along with
- c$ H1 _1 c5 Nsolid food. He had no hospitalizations or surgery,; \( Z/ `& M2 T5 o
and his psychosocial and psychomotor development1 a' f* S3 Q+ |) h+ k+ m0 `
was age appropriate.$ Y' F) [* T8 j+ \' {! v
The family history was remarkable for the father,
1 G, N, f4 d: `# o; i* Vwho was diagnosed with hypothyroidism at age 16," [. X9 w; K2 T. S
which was treated with thyroxine. The father’s
1 ]! q M! Z- s: Bheight was 6 feet, and he went through a somewhat! a7 H' s* i( Q& b/ r! L
early puberty and had stopped growing by age 14.
2 \; u" Q, b ]4 vThe father denied taking any other medication. The
/ n4 W0 A9 T2 }+ L# v" G$ echild’s mother was in good health. Her menarche
/ c; H- k6 b! S! p, ?9 Jwas at 11 years of age, and her height was at 5 feet
9 ~% E) B- Z$ X7 N. W; J' L5 @! q5 inches. There was no other family history of pre-& h( i; F" ^# E; m2 ]
cocious sexual development in the first-degree rela-
" S3 L% [% H4 {tives. There were no siblings.: ]" `& L5 G4 P+ g
Physical Examination
w" `& A# g, A0 W: P: T* n; H% tThe physical examination revealed a very active," v7 _5 [) c7 M4 c2 C3 G- ?+ {
playful, and healthy boy. The vital signs documented" f: U# Z* ^1 Z, I& J
a blood pressure of 85/50 mm Hg, his length was: _$ l/ y; x7 ~) I. [& U+ t5 |
90 cm (>97th percentile), and his weight was 14.4 kg4 g7 y6 I8 Y8 @; Y( \1 J7 n: K' C
(also >97th percentile). The observed yearly growth
9 b1 M! ]; d+ ]7 ~1 Dvelocity was 30 cm (12 inches). The examination of
7 z I1 j! W& I) C8 N- E# M" ~' [the neck revealed no thyroid enlargement.# x6 c7 k% s2 x
The genitourinary examination was remarkable for
8 \2 k: c& v3 zenlargement of the penis, with a stretched length of
) B, }1 b S; `' e n6 u, S9 k8 cm and a width of 2 cm. The glans penis was very well
* H% N0 r1 j* g3 u. S" Vdeveloped. The pubic hair was Tanner II, mostly around
( I c& i8 E) M/ `' W. [540
* F7 B% U8 S5 M$ v. O8 N( rat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
% [! f; M4 M/ j5 K! ythe base of the phallus and was dark and curled. The7 `" T) [: Z) f4 u- F4 U
testicular volume was prepubertal at 2 mL each.
: r0 Z8 k1 R2 w- O$ }* _The skin was moist and smooth and somewhat
# I* }1 l0 g0 {3 h$ C. I2 j. F0 Xoily. No axillary hair was noted. There were no' |3 V3 r* e6 \; J! F
abnormal skin pigmentations or café-au-lait spots.
, U( m4 p( A7 }, h0 dNeurologic evaluation showed deep tendon reflex 2+
6 `/ @% b4 U( E! T( f; n- D6 fbilateral and symmetrical. There was no suggestion
: p+ k$ W! ~' y: L. W, I, Vof papilledema.
5 E% R h2 v/ Z2 Y8 i! qLaboratory Evaluation
, N( X3 g# S5 ]! I# ^* b( eThe bone age was consistent with 28 months by* `' P6 O; O6 L" D9 h2 S' K/ O( u
using the standard of Greulich and Pyle at a chrono-$ A! n4 E; g; M: Y. m9 G) _
logic age of 16 months (advanced).5 Chromosomal
' c+ v' u; _: {$ q7 F, n Qkaryotype was 46XY. The thyroid function test
; z# U$ q" T; {5 E" F! Lshowed a free T4 of 1.69 ng/dL, and thyroid stimu-
% ^' ?1 L6 i- qlating hormone level was 1.3 µIU/mL (both normal).$ g! i# O* Q, A9 n1 J/ ^
The concentrations of serum electrolytes, blood, R: T( P! P9 l- v8 ?" r+ y
urea nitrogen, creatinine, and calcium all were2 N, z, H. ? a; K8 G1 H
within normal range for his age. The concentration
& x, A( | x' K& Z6 f2 Mof serum 17-hydroxyprogesterone was 16 ng/dL) l( o; X# u4 S" {$ L$ h' G
(normal, 3 to 90 ng/dL), androstenedione was 20& _/ y, A: n6 S; S$ \, p
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros- ]1 t" q: `/ K) Q
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
9 W$ v6 e( Z& }/ F* hdesoxycorticosterone was 4.3 ng/dL (normal, 7 to
1 O/ v% E3 a4 ~8 Y$ R1 x1 D; _: ^' {* ~49ng/dL), 11-desoxycortisol (specific compound S)
) Q# Y" v5 i$ F: m1 k2 kwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
/ U$ g4 ?1 n8 g1 O; htisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
9 r M. ^( d- b g; q0 atestosterone was 60 ng/dL (normal <3 to 10 ng/dL),
5 }3 I* n" u; j2 f9 \and β-human chorionic gonadotropin was less than1 R8 |0 }/ K$ Z7 r7 j' N/ x8 @
5 mIU/mL (normal <5 mIU/mL). Serum follicular
, v- d$ E) g4 g' a. H( w3 Istimulating hormone and leuteinizing hormone
1 K, K4 P; T& J5 p$ Mconcentrations were less than 0.05 mIU/mL) g0 ?2 D' \7 J2 q: k% ]4 X0 l
(prepubertal).
; N% ^5 u6 u7 A* U) c0 Y0 i1 [; cThe parents were notified about the laboratory
" u" |! M- U' j! E; O* a2 q3 \results and were informed that all of the tests were
1 t) L5 N4 h" E0 q% t y" i9 Qnormal except the testosterone level was high. The
. |- r p1 s3 Nfollow-up visit was arranged within a few weeks to
" M; z1 F* D& S7 g) ]& i& _$ \obtain testicular and abdominal sonograms; how- D7 g' H5 [$ E7 o
ever, the family did not return for 4 months.
, j# ]) t: N% E( z* T: p" SPhysical examination at this time revealed that the
( _+ X( k2 ]/ Z! d: b h' f4 Ychild had grown 2.5 cm in 4 months and had gained& \# O. _6 a( K/ p4 B
2 kg of weight. Physical examination remained
$ [% e# c; e" W, [: K# b: o9 s5 runchanged. Surprisingly, the pubic hair almost com-: M% m# ?8 r* H! X1 Q5 `5 w- v3 M
pletely disappeared except for a few vellous hairs at
/ J' E' p. A$ a6 R/ ~7 dthe base of the phallus. Testicular volume was still 26 @) q2 e# `; k9 l
mL, and the size of the penis remained unchanged.
/ ~ B0 A+ \4 J6 \* Z* [0 tThe mother also said that the boy was no longer hav-4 j9 q8 m& u- I$ ^& i" T+ P, e9 Z- Z
ing frequent erections.
% p$ o) @9 F: L4 F5 rBoth parents were again questioned about use of
! j1 p( p6 @0 p1 v% M- m& U, @( eany ointment/creams that they may have applied to
/ v* N# [$ a1 q: x" f0 Ethe child’s skin. This time the father admitted the2 [! D4 ` x" ]( ]( r% b6 L
Topical Testosterone Exposure / Bhowmick et al 541
5 s( w2 Y ] [use of testosterone gel twice daily that he was apply-
$ H4 [7 r: y1 F# N: w% ning over his own shoulders, chest, and back area for; Y |# o/ J+ Q# V
a year. The father also revealed he was embarrassed
/ ^, C* P( J; [to disclose that he was using a testosterone gel pre-/ t P( g; e& A( O2 I
scribed by his family physician for decreased libido% J. `; p6 b: D% I. s
secondary to depression.
4 W9 n; |/ b/ h4 c0 W# g8 C5 jThe child slept in the same bed with parents.
1 t7 t- y' K* K/ ?* YThe father would hug the baby and hold him on his
. G% R7 D6 Z5 H6 n, t+ @chest for a considerable period of time, causing sig-
1 q7 G: e; B5 w/ Tnificant bare skin contact between baby and father.
' _0 O" ]# ]9 n$ k4 NThe father also admitted that after the phone call,
% v; {9 _- f( z" u2 N! vwhen he learned the testosterone level in the baby* O% V W' e+ F
was high, he then read the product information! X+ }6 }' Y' J' z2 S8 x
packet and concluded that it was most likely the rea-
4 S/ F$ w# _9 O. M4 N( {3 R9 Qson for the child’s virilization. At that time, they, R: ?7 Y2 X2 i+ Q% Y4 z
decided to put the baby in a separate bed, and the
; s+ [# H2 m4 Pfather was not hugging him with bare skin and had
/ r y# X# t j' V% Bbeen using protective clothing. A repeat testosterone$ R) \) R% F- W' Y$ V1 I
test was ordered, but the family did not go to the
& i7 w+ F6 C7 S% ^; i# `laboratory to obtain the test.3 t. j$ m$ M8 L- o+ c X8 H
Discussion
! j$ F5 K; K4 R, APrecocious puberty in boys is defined as secondary
6 i6 H8 `1 P" |, S' ]sexual development before 9 years of age.1,4! Y6 j% [# \; k6 `5 Y7 `4 i
Precocious puberty is termed as central (true) when
0 X. B* H4 V% R% P: w0 lit is caused by the premature activation of hypo-
$ w5 k: Q8 G6 ~thalamic pituitary gonadal axis. CPP is more com-
8 \. p+ Q; G) l4 @mon in girls than in boys.1,3 Most boys with CPP: T* j: ]2 C" }, \
may have a central nervous system lesion that is
- o- _+ k; `" z& _6 N8 Oresponsible for the early activation of the hypothal-
: d* d% }5 D/ F: ~9 r0 h1 y0 ~amic pituitary gonadal axis.1-3 Thus, greater empha- G6 Z3 l+ h3 |4 x- a6 h$ u2 t9 i
sis has been given to neuroradiologic imaging in0 z$ k. r4 Z R* ]
boys with precocious puberty. In addition to viril-, R8 Q! _( v9 e2 h
ization, the clinical hallmark of CPP is the symmet-
) y# U; U7 W' S" q! b9 |7 k& W* [rical testicular growth secondary to stimulation by
0 ]% ?1 T+ J) f6 r7 {2 M. egonadotropins.1,3# Z6 `! X, C( `: D: a2 e+ M
Gonadotropin-independent peripheral preco-
1 l0 v# W( j' hcious puberty in boys also results from inappropriate. ^" W2 v1 ~0 y) Z" P; k s& i
androgenic stimulation from either endogenous or
, n3 D. o% N2 [1 xexogenous sources, nonpituitary gonadotropin stim-2 g( k- U$ r- S, ?# t5 T, S1 o4 u# h( l3 `
ulation, and rare activating mutations.3 Virilizing
' B( ~; ^2 Q6 K' Y: Q+ T+ l M5 acongenital adrenal hyperplasia producing excessive( k" T8 {) |' _/ Y7 ^
adrenal androgens is a common cause of precocious
/ U0 {6 I+ n9 Y! vpuberty in boys.3,4
, ^8 i! C8 U! @The most common form of congenital adrenal/ e0 R# {% ^; S- X6 Z8 t6 F5 O1 \% Q
hyperplasia is the 21-hydroxylase enzyme deficiency.
2 b! _7 [8 A: q p, mThe 11-β hydroxylase deficiency may also result in" T2 q* x2 F$ ~) i ^+ l
excessive adrenal androgen production, and rarely,
( g2 X6 R: ]2 E/ Z) Xan adrenal tumor may also cause adrenal androgen+ m+ z# C# W7 {4 y/ E
excess.1,30 Z! b& d, s, b% [+ t2 E: ~
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
* f4 b. I" h9 j7 Y7 a& R542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
- ]" m# S4 ~0 C$ WA unique entity of male-limited gonadotropin-
$ y' W. u6 t+ B) H$ H# ~independent precocious puberty, which is also known
8 H7 y9 s( P* v R+ A( Q; m, {as testotoxicosis, may cause precocious puberty at a! {+ H7 l4 R- H! X$ y" A
very young age. The physical findings in these boys
) I! U& Z |4 p. w6 G3 L4 m z: I0 \with this disorder are full pubertal development,
! o' f ]! h/ I8 a' @8 l. ~including bilateral testicular growth, similar to boys
) c; V1 f3 s# _: V+ \with CPP. The gonadotropin levels in this disorder1 t4 P+ p, M/ }, {) {& F) r
are suppressed to prepubertal levels and do not show% D, H5 T( n# `# ], j
pubertal response of gonadotropin after gonadotropin-5 E( l1 H0 K, Y5 j8 a
releasing hormone stimulation. This is a sex-linked
/ P/ C- U, u3 P% Eautosomal dominant disorder that affects only; s) A: ^* z+ p9 ^4 b
males; therefore, other male members of the family9 ~8 C: w X$ ^# ?2 N' P) V
may have similar precocious puberty.37 V$ K; K! O- N
In our patient, physical examination was incon-5 u# |, Z0 T3 x. n0 `! l3 i4 A
sistent with true precocious puberty since his testi-
: [# m( U9 P' @" H7 L5 b$ D, A: vcles were prepubertal in size. However, testotoxicosis
5 w. I$ j/ U4 U9 awas in the differential diagnosis because his father
4 @; w& n3 C9 ?( u% ~started puberty somewhat early, and occasionally,
# X c. c& n9 g3 G3 m$ P# e! ^testicular enlargement is not that evident in the' \6 Q" W" j! i0 |/ _! U) w
beginning of this process.1 In the absence of a neg-( W% d3 D: o! g/ n+ C1 w6 _
ative initial history of androgen exposure, our
% C% T- N) F }9 x4 Xbiggest concern was virilizing adrenal hyperplasia,
) J3 m# p) v2 @8 h* `either 21-hydroxylase deficiency or 11-β hydroxylase9 i% i" W4 B; l- Q0 w# E
deficiency. Those diagnoses were excluded by find-
) i5 ?6 @. Q; u: J7 G" x) _ing the normal level of adrenal steroids.
7 s+ j! J+ F; L% y7 Q, kThe diagnosis of exogenous androgens was strongly* B% g* \! w' ?% |+ _5 b a
suspected in a follow-up visit after 4 months because0 C- E" y6 I; r6 {) f
the physical examination revealed the complete disap-
- L! h) x1 e! W* Qpearance of pubic hair, normal growth velocity, and/ n; f2 J& h$ \
decreased erections. The father admitted using a testos-; G) F+ g$ N3 Z2 W* K7 G* G. Y
terone gel, which he concealed at first visit. He was
2 W- u9 [) p: Tusing it rather frequently, twice a day. The Physicians’7 v5 ~; |8 W; N u! W/ V; F
Desk Reference, or package insert of this product, gel or
4 q, N* w# w% z! v. Jcream, cautions about dermal testosterone transfer to- Y+ g% d. y3 N1 f, ?
unprotected females through direct skin exposure.
8 f3 v1 K; [' M' V5 y% K% Z0 eSerum testosterone level was found to be 2 times the! x5 {9 T# w: K9 C
baseline value in those females who were exposed to
" f& y$ ?3 v/ j) A, Q$ c* l8 Xeven 15 minutes of direct skin contact with their male6 w3 L( h! \, N: d* I% @ l
partners.6 However, when a shirt covered the applica-
* V, w! w# M% |: x: W4 ?3 b6 stion site, this testosterone transfer was prevented.
( O b, C8 Y! g, `7 G5 M" \, }Our patient’s testosterone level was 60 ng/mL,# b! C! I/ ?# ^& D+ d: z6 h7 s
which was clearly high. Some studies suggest that4 }9 N6 X8 g% _ e0 W
dermal conversion of testosterone to dihydrotestos-
" f2 q4 W5 ]( @* oterone, which is a more potent metabolite, is more
' Z( E8 A- g7 A1 c7 Mactive in young children exposed to testosterone6 \+ \* V: O1 d( N ]: E% O, h: w
exogenously7; however, we did not measure a dihy-
7 w/ m/ ~' e; L4 ~drotestosterone level in our patient. In addition to* C% b: v0 {5 a
virilization, exposure to exogenous testosterone in6 `$ [4 { ?4 O+ y) I
children results in an increase in growth velocity and' e& r% q5 J M$ T+ u
advanced bone age, as seen in our patient.
: P. l$ z6 M5 h2 e8 e5 YThe long-term effect of androgen exposure during
7 [. o# K" j3 n, f; `- v2 Dearly childhood on pubertal development and final4 ?8 W( C. A6 c8 \8 Q4 y
adult height are not fully known and always remain
( _9 q4 h% Q, B6 X2 s5 C" Ga concern. Children treated with short-term testos-
! I! I* y& O% U ~6 f& a5 oterone injection or topical androgen may exhibit some/ V3 v8 R7 R X7 v/ _
acceleration of the skeletal maturation; however, after
; k# X7 e& O e, g9 ]: |2 [! C, ^cessation of treatment, the rate of bone maturation
2 l* {# C' t5 m% bdecelerates and gradually returns to normal.8,9
+ y8 A6 W* T; W% q) x3 u0 k# XThere are conflicting reports and controversy
- k4 B7 C& M/ zover the effect of early androgen exposure on adult
_- J) l; R' _" \, hpenile length.10,11 Some reports suggest subnormal
& y9 c# [3 A' f4 Yadult penile length, apparently because of downreg-
: A; ^( K0 F2 P0 h1 Q+ zulation of androgen receptor number.10,12 However,
x7 d: U5 S1 e+ e' g6 rSutherland et al13 did not find a correlation between9 n+ N$ d( Q( N2 Z) [3 M( I2 I, x/ D
childhood testosterone exposure and reduced adult* k: x, T7 K- |; \ ?# ?5 @
penile length in clinical studies.
' a2 E7 Q1 k& _Nonetheless, we do not believe our patient is
1 j' r% k C7 H5 |$ w3 t" igoing to experience any of the untoward effects from
5 V0 R7 e( Q9 \testosterone exposure as mentioned earlier because
9 `3 t, L7 _5 S, k n1 d) H: hthe exposure was not for a prolonged period of time.
2 \2 F0 i6 ^! F4 r* o3 T# xAlthough the bone age was advanced at the time of
( ?) p! | n& Q5 e! \0 odiagnosis, the child had a normal growth velocity at6 Z' v) n- ~, |3 t) U. ?* T( D
the follow-up visit. It is hoped that his final adult
3 \" ^; k; C6 f6 t8 vheight will not be affected.( \2 S% v+ O4 g9 E, A! l4 ~! {
Although rarely reported, the widespread avail-
1 W6 ^! Z7 i- `' A/ X1 P/ t4 N0 aability of androgen products in our society may
0 J0 b% v3 Q; t6 t- w2 sindeed cause more virilization in male or female4 v4 e+ }7 O0 e1 j' ~
children than one would realize. Exposure to andro-
, L) ~! ?" I) ngen products must be considered and specific ques-
5 n% ]( z* e3 s7 otioning about the use of a testosterone product or
. c6 J8 `4 r; {: [; J( ggel should be asked of the family members during
$ d% E2 N( B/ ^3 h4 Pthe evaluation of any children who present with vir-
' [; H& `" v* C! Q3 Oilization or peripheral precocious puberty. The diag-
$ n R( r8 s2 H8 j# l! @3 q1 B) Gnosis can be established by just a few tests and by
& M( T! j4 v2 [" [, I' I+ | Eappropriate history. The inability to obtain such a# Y4 o* d% L2 |: ]$ m
history, or failure to ask the specific questions, may
* F9 \! v0 D4 D$ ?$ |result in extensive, unnecessary, and expensive
/ O5 J& z8 S8 @; ~/ `* winvestigation. The primary care physician should be
9 O6 L d G4 W$ V! s7 h- e9 b9 D' Iaware of this fact, because most of these children' p! ?" Q# p5 k- d y N* z
may initially present in their practice. The Physicians’
" y1 i, F5 S1 U- Q6 IDesk Reference and package insert should also put a
; Y! C6 n) n2 e" S* owarning about the virilizing effect on a male or
6 c: Z4 E- O- Ffemale child who might come in contact with some-
) m; |% p( P) F2 B+ c1 F2 i: Yone using any of these products.$ D% P% o& P; r) ~3 S- G9 R
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Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;
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! l4 y4 E3 u0 A6 {5 o- U2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious) d. J; j- {# }7 j" F4 H; E
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Skeletal Development of the Hand and Wrist. 2nd ed.& q+ N, c+ @( f: Z4 X* c$ l
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