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is a significant concern for physicians. Central( d$ v& a: R" \( T; @0 ?% p" ]7 X
precocious puberty (CPP), which is mediated M; ~* c' O: j# c" @, c2 l' \% n* o
through the hypothalamic pituitary gonadal axis, has
/ _; {% A# O0 h* c/ ~' h. N$ G' g2 Za higher incidence of organic central nervous system/ _: Q5 E/ o$ p% o" P- c
lesions in boys.1,2 Virilization in boys, as manifested, K* s8 |7 Y4 d9 B$ q; f
by enlargement of the penis, development of pubic5 B; v" s% h; m; M' ]6 r9 p% ?
hair, and facial acne without enlargement of testi-( n2 p2 o! Q6 x* m# S) G
cles, suggests peripheral or pseudopuberty.1-3 We
# ^- m% z, `5 }# t8 xreport a 16-month-old boy who presented with the
+ x: p' ~9 D3 n) i( @ z. Venlargement of the phallus and pubic hair develop-
W, {5 N; I) {( j1 k3 rment without testicular enlargement, which was due
. H& S h5 U( a7 M# ~! i, Zto the unintentional exposure to androgen gel used by
1 c" f3 x7 A& v$ X; lthe father. The family initially concealed this infor-) j, U I8 A. ^ y9 M
mation, resulting in an extensive work-up for this
4 }; A6 O- O3 t5 ?! D; ^$ ]child. Given the widespread and easy availability of
, C' G% a6 k2 c( \5 u ltestosterone gel and cream, we believe this is proba-
" \4 i) g7 g) ?+ r7 N! _, _ X; B5 Dbly more common than the rare case report in the3 h* b/ y8 r4 X7 K' N2 T
literature.4
4 u; n* f9 Q1 @: ?Patient Report
1 s8 z) n @1 q, fA 16-month-old white child was referred to the
e& G( t% N+ F" ]6 C" Mendocrine clinic by his pediatrician with the concern, m" k( s+ ^( o2 N$ D2 P3 x
of early sexual development. His mother noticed1 A, W1 K+ H5 p4 z
light colored pubic hair development when he was c1 K; P6 U: P) H" Y- k! @3 K
From the 1Division of Pediatric Endocrinology, 2University of
9 J% K6 e- d5 }South Alabama Medical Center, Mobile, Alabama.
( s ^3 O2 p8 N7 iAddress correspondence to: Samar K. Bhowmick, MD, FACE,
. i% H9 Z( h9 @, a/ y; yProfessor of Pediatrics, University of South Alabama, College of+ {. f2 O+ F3 _7 K6 i0 _4 |7 t- {6 L
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;: v+ m7 f6 s& u( }; e4 \
e-mail: [email protected].
, m. L: u( V; m7 w' \+ ~/ Cabout 6 to 7 months old, which progressively became+ {5 a' w, v2 m) N' n7 n6 j
darker. She was also concerned about the enlarge-
! u4 n( B. u* y. ^8 nment of his penis and frequent erections. The child
$ P3 u% D; ]2 ] o! Mwas the product of a full-term normal delivery, with
" P3 U \' d7 oa birth weight of 7 lb 14 oz, and birth length of
3 I, r" R) \) a2 I4 n: r20 inches. He was breast-fed throughout the first year
, C' _3 D) N3 G* U3 yof life and was still receiving breast milk along with; C' H& ~% C5 A! g
solid food. He had no hospitalizations or surgery,! T/ C* n8 a5 i4 `8 { y* ?( X
and his psychosocial and psychomotor development
9 z% p- T3 f9 ?! B. c0 Dwas age appropriate.: K: C/ j4 e- m0 M7 D/ w1 ?$ q
The family history was remarkable for the father,
5 X% e o: L) d. w; P+ jwho was diagnosed with hypothyroidism at age 16,
9 U' e6 ?7 [( @8 k7 [5 twhich was treated with thyroxine. The father’s
& ]: u+ C9 }/ C) s" N) S, Zheight was 6 feet, and he went through a somewhat# l4 a& j3 l: Y4 |3 L0 j# ?
early puberty and had stopped growing by age 14.$ R$ U# l- {% W, Y4 M
The father denied taking any other medication. The
+ m) e+ I6 t. j$ c- e; zchild’s mother was in good health. Her menarche
( ]# f; b6 r" A- o; O2 Y9 {was at 11 years of age, and her height was at 5 feet! a0 \+ f; ^, h) y
5 inches. There was no other family history of pre-0 C. s2 g. h2 w+ i
cocious sexual development in the first-degree rela-) l/ c# m0 z D! C1 r
tives. There were no siblings.; Z6 z9 |3 D+ T% O6 t# p
Physical Examination
: ], }* K" Y# F7 `% e( @, y% n1 tThe physical examination revealed a very active,2 o5 a& i' G. {2 w! C1 a- ^
playful, and healthy boy. The vital signs documented9 t6 ^& r. e$ O' Y
a blood pressure of 85/50 mm Hg, his length was
+ u& P4 o! F: X4 C90 cm (>97th percentile), and his weight was 14.4 kg0 T, A- | }: l; d, C
(also >97th percentile). The observed yearly growth
4 L0 F$ C% j' z- svelocity was 30 cm (12 inches). The examination of
! U% z9 b! i9 [2 H, M. vthe neck revealed no thyroid enlargement.
5 A* |/ Q( I5 L) X0 ]( V9 a4 k. Q( UThe genitourinary examination was remarkable for
$ G8 ` U. w" p9 k( j5 e6 Nenlargement of the penis, with a stretched length of
; E3 W3 a, J$ e) ?8 cm and a width of 2 cm. The glans penis was very well
- g3 w+ j, o: D% e* d/ y0 Adeveloped. The pubic hair was Tanner II, mostly around
~# p9 D( |* ]. H3 n540
; r! U) @( L5 K$ q3 Yat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
- U r8 d' |/ G! ?; W/ h2 tthe base of the phallus and was dark and curled. The
8 Y& J$ u& l0 J+ [/ ztesticular volume was prepubertal at 2 mL each.
5 | R, Y) D. dThe skin was moist and smooth and somewhat: y, j5 N# s: P$ Z* N
oily. No axillary hair was noted. There were no
2 f7 k* U, R( \- aabnormal skin pigmentations or café-au-lait spots." r5 S* u& p* G$ G6 v6 }. x2 o$ W
Neurologic evaluation showed deep tendon reflex 2+
8 v" P+ p2 P( y% N% y: b9 I! d+ cbilateral and symmetrical. There was no suggestion" [4 P3 X3 O! d) D- k/ O. U
of papilledema.: o3 \/ [$ r! I; Y7 S; G" j
Laboratory Evaluation
7 I& P0 f3 z( j! KThe bone age was consistent with 28 months by
7 T3 [/ }# {# Y/ ~4 d: h- B8 vusing the standard of Greulich and Pyle at a chrono-/ m; f3 W: }' Z+ B. C7 @1 Z0 g3 U, p6 Q
logic age of 16 months (advanced).5 Chromosomal ]3 ~7 n! s$ Y0 H. M9 ?
karyotype was 46XY. The thyroid function test
. g6 r2 x0 k+ L4 K# ashowed a free T4 of 1.69 ng/dL, and thyroid stimu-0 P/ _$ E9 I) E: q8 N
lating hormone level was 1.3 µIU/mL (both normal).
4 T: U: P( O. C( K, X: E0 PThe concentrations of serum electrolytes, blood
' A1 P0 X( F' {9 C! x0 @urea nitrogen, creatinine, and calcium all were; ?3 P9 f& R, z8 h" {& l
within normal range for his age. The concentration
: B/ q1 @. a# r: |+ v5 y& @of serum 17-hydroxyprogesterone was 16 ng/dL
/ U7 K$ D2 a: j# F(normal, 3 to 90 ng/dL), androstenedione was 20( h$ f' G4 Y3 `4 W) B! L2 G
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-5 d4 h. U1 H2 ?9 c2 `9 } u
terone was 38 ng/dL (normal, 50 to 760 ng/dL),+ G+ n) r8 ?$ ?$ A' m
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
" H' M; ]( j! K0 O0 h6 T! \49ng/dL), 11-desoxycortisol (specific compound S)
/ V0 ?% n6 v' E9 ]# v' H- Owas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
7 E* A( i5 E6 T8 Rtisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
! z! P! l/ P: J7 M" ktestosterone was 60 ng/dL (normal <3 to 10 ng/dL),3 A* ^- Y4 P" Z- R+ O4 @
and β-human chorionic gonadotropin was less than
) g, v/ R! e5 n5 mIU/mL (normal <5 mIU/mL). Serum follicular" c, |8 e% e4 d) I8 H. U! X
stimulating hormone and leuteinizing hormone
2 x7 o4 A3 P- c* @concentrations were less than 0.05 mIU/mL6 H9 h, T' b5 Q0 y5 ^8 h
(prepubertal).5 P% z& Y) F8 s: l0 _. U
The parents were notified about the laboratory9 P9 a, b" o) n
results and were informed that all of the tests were
$ Q k) S( {9 z- K fnormal except the testosterone level was high. The$ P% {( l F4 i$ e. c$ K' U
follow-up visit was arranged within a few weeks to, d9 O& i& |. x Z# n; Z5 Q% F1 R, s" s
obtain testicular and abdominal sonograms; how-
, D. F& B0 G! R) i" N2 |6 c9 eever, the family did not return for 4 months.
, b- y0 {) v9 W7 f: {Physical examination at this time revealed that the0 u! {0 ?* h* f
child had grown 2.5 cm in 4 months and had gained
4 ~2 k- _- X" Y0 m+ e2 s2 kg of weight. Physical examination remained# Q% ?( K {& M; P4 u
unchanged. Surprisingly, the pubic hair almost com-0 q) z% f$ A2 D, I5 @( O# d
pletely disappeared except for a few vellous hairs at
2 q4 Z, w# m. a+ C9 h" e8 a2 s6 R, athe base of the phallus. Testicular volume was still 2( v3 q0 [. U' v& V: H0 e5 r
mL, and the size of the penis remained unchanged." Q5 q* C- @ e# m d1 S( p
The mother also said that the boy was no longer hav-7 g: m0 x3 t+ J& N6 g7 @* k/ E
ing frequent erections.8 k! `% B! h- L1 Q3 H8 C
Both parents were again questioned about use of1 X5 {; ?' [1 h6 I3 {8 o# i
any ointment/creams that they may have applied to7 H. q& z' {& \/ d! J; r) |
the child’s skin. This time the father admitted the
+ w2 e; V. u' j$ UTopical Testosterone Exposure / Bhowmick et al 541
3 f! G) M* K. A* j3 h: O- {- n9 \use of testosterone gel twice daily that he was apply-
1 I) G3 y: ~5 i" N6 {ing over his own shoulders, chest, and back area for
) G3 L6 U1 C1 x% f* u0 `$ U Na year. The father also revealed he was embarrassed
2 w8 D7 \4 R4 c: Y5 oto disclose that he was using a testosterone gel pre-% b( a4 w8 V R8 `5 A7 }
scribed by his family physician for decreased libido: `$ M9 U$ w$ z+ t1 [
secondary to depression.
9 W1 @& H: g, v( t4 u UThe child slept in the same bed with parents.& D. K8 t2 A+ |0 A
The father would hug the baby and hold him on his
# x/ Q. D( j. |4 N; xchest for a considerable period of time, causing sig-% n+ W6 u; w/ H
nificant bare skin contact between baby and father., ^2 E# P# o: U' t1 y
The father also admitted that after the phone call,1 N6 {; ?( ?1 Q$ V" f5 g
when he learned the testosterone level in the baby% v2 {8 J. k% R, m. j
was high, he then read the product information
; P q6 U b9 npacket and concluded that it was most likely the rea-
* \) P: `- ^" s" O4 z& hson for the child’s virilization. At that time, they
j8 N) d" d7 X l8 G# n- tdecided to put the baby in a separate bed, and the, D. W: E- t- ?# h
father was not hugging him with bare skin and had
; O5 w& K' H# \+ j9 K( O8 v" Cbeen using protective clothing. A repeat testosterone
( _% f7 o7 d* E. O. |0 v, }' Ftest was ordered, but the family did not go to the
7 K1 q' s6 [& i/ ^ j6 g D, t" {laboratory to obtain the test.5 {3 L7 D9 _. N& {/ }
Discussion
+ k9 `: u. Q9 ~) _3 ZPrecocious puberty in boys is defined as secondary4 C- C, f/ r- B% F' Z& x6 Y
sexual development before 9 years of age.1,4
5 C/ W) Y* P) ]3 J* y- }Precocious puberty is termed as central (true) when
2 t4 D2 ]; W6 c: G; f6 oit is caused by the premature activation of hypo-; [% O2 V+ h- V3 e
thalamic pituitary gonadal axis. CPP is more com-
" N$ T l4 J- i' S8 I; \mon in girls than in boys.1,3 Most boys with CPP. z, c: E! j) T- e) T( |
may have a central nervous system lesion that is
! Q W5 O' U# p6 u* j" |responsible for the early activation of the hypothal-
+ O& _- b/ _. ^7 B) Z# iamic pituitary gonadal axis.1-3 Thus, greater empha-
: i" A$ |' K: f y( y( @+ \6 [& `sis has been given to neuroradiologic imaging in
4 k u& f6 c8 v: o0 M* a2 H: \6 yboys with precocious puberty. In addition to viril-
, d% }, ?$ h( b" _. Vization, the clinical hallmark of CPP is the symmet-9 @7 u& C! e& E' C0 s
rical testicular growth secondary to stimulation by) e: Y, Y% y% E0 Q' f# i
gonadotropins.1,3
$ I( t3 q0 |/ [0 w/ XGonadotropin-independent peripheral preco-
$ i4 y4 a! n, ucious puberty in boys also results from inappropriate7 s) z2 k! e. W x( M6 k0 F
androgenic stimulation from either endogenous or
: f7 m0 L: f6 N' v3 E6 I! _1 M4 Rexogenous sources, nonpituitary gonadotropin stim-9 @3 P }! ~9 k
ulation, and rare activating mutations.3 Virilizing
9 n9 I. p% D8 Q0 O. A Hcongenital adrenal hyperplasia producing excessive5 y+ \4 W% ~7 D& p+ W7 U
adrenal androgens is a common cause of precocious4 ? _) x* j+ G9 R3 z5 _) d) Z, y. ?
puberty in boys.3,4
& h9 v$ y' O! Z4 P( s- rThe most common form of congenital adrenal
$ ?. Y+ I- w+ ihyperplasia is the 21-hydroxylase enzyme deficiency./ t0 V% c$ m) C' L9 c* n
The 11-β hydroxylase deficiency may also result in7 T1 b! y) n4 d. w8 x5 \
excessive adrenal androgen production, and rarely,* p# ?7 g; _1 v0 X M
an adrenal tumor may also cause adrenal androgen) v2 O8 A/ ~; l1 K4 [" F/ @
excess.1,3
: n1 |9 w* D7 x2 O3 oat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from6 _- c; u4 K2 d$ m
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
( S9 \. A* s) x) v( VA unique entity of male-limited gonadotropin-
( J% [- R& j2 F; {( _; Lindependent precocious puberty, which is also known* X# O2 R- w1 @4 Y, T5 z
as testotoxicosis, may cause precocious puberty at a
# E9 s+ Q; [6 _( R% M. Yvery young age. The physical findings in these boys
) M( u0 T1 b8 _& uwith this disorder are full pubertal development,
5 }- [1 |# h- b9 j# D3 Y+ Bincluding bilateral testicular growth, similar to boys
9 \+ O w& y2 |# U( gwith CPP. The gonadotropin levels in this disorder6 ^" \. E; D; |! h% C
are suppressed to prepubertal levels and do not show
2 _ P6 }+ l: X9 Y ^pubertal response of gonadotropin after gonadotropin-
, B( `# D* L8 S. G! c! r' I% ~releasing hormone stimulation. This is a sex-linked
1 n! A4 y+ |; A/ d0 Kautosomal dominant disorder that affects only
* g$ T9 J& @4 g- O; e8 {, Gmales; therefore, other male members of the family! [, J' F2 q$ d; }7 I
may have similar precocious puberty.3
) e4 o! |6 G: U9 r; \7 }! ]In our patient, physical examination was incon-
, \$ q! q k; J5 b& f, w; ~% lsistent with true precocious puberty since his testi-
9 B0 H- I" j6 j6 r" h" Q5 L+ dcles were prepubertal in size. However, testotoxicosis0 l! w: L3 h. C% w/ D
was in the differential diagnosis because his father
, L! I0 c; o* b/ @" J, q+ s$ v6 Estarted puberty somewhat early, and occasionally,1 @; W, S$ H0 P# N2 b4 ^0 J
testicular enlargement is not that evident in the3 g7 a0 c! R2 w C |5 N
beginning of this process.1 In the absence of a neg-4 i% ]0 F0 S/ V! c
ative initial history of androgen exposure, our
' T) v! [& d. \6 ?biggest concern was virilizing adrenal hyperplasia," x$ R8 u+ n+ y% g1 p" @
either 21-hydroxylase deficiency or 11-β hydroxylase1 t# R2 R' W4 n9 [
deficiency. Those diagnoses were excluded by find-5 b; M0 _( T3 R) v) P
ing the normal level of adrenal steroids.
2 u6 r& a4 P: N) oThe diagnosis of exogenous androgens was strongly% Q9 n" r5 J( O! ~ L7 L5 _2 o
suspected in a follow-up visit after 4 months because# j1 ?) v6 p0 B/ W7 E8 X
the physical examination revealed the complete disap-) p- g/ A7 l9 b* A2 D2 Z
pearance of pubic hair, normal growth velocity, and, O7 `8 ^0 e, W6 i9 X' N! |7 T. ?- _3 v
decreased erections. The father admitted using a testos-
u; O" N+ C9 z1 s0 K" v3 x8 aterone gel, which he concealed at first visit. He was
8 O& N4 _3 N* r! ?using it rather frequently, twice a day. The Physicians’
2 P1 j5 [. a# }6 D3 N# }4 sDesk Reference, or package insert of this product, gel or$ B2 t- `& w; W5 s* B
cream, cautions about dermal testosterone transfer to
4 c2 o+ w0 C' o' ? t/ C }unprotected females through direct skin exposure.5 j$ J8 u$ e \4 o% }
Serum testosterone level was found to be 2 times the2 V Y, Y8 m* l& q
baseline value in those females who were exposed to
- j3 @0 v- X, C3 leven 15 minutes of direct skin contact with their male
+ o$ ]8 A6 G2 V. }+ npartners.6 However, when a shirt covered the applica-9 t. m. `1 A$ Q) }
tion site, this testosterone transfer was prevented.
4 K* a/ \$ B8 b# S. t* fOur patient’s testosterone level was 60 ng/mL,5 d4 d% o y8 U I
which was clearly high. Some studies suggest that/ T% Q# A+ r N: _" P$ h6 ^& y
dermal conversion of testosterone to dihydrotestos-6 C' _* w+ h4 Z
terone, which is a more potent metabolite, is more
( z5 [* E9 F" l/ @active in young children exposed to testosterone2 Y" E, ]7 ]& k' ^6 f3 Q
exogenously7; however, we did not measure a dihy-
; k2 Z; z" Q/ e+ d) F% W# W$ fdrotestosterone level in our patient. In addition to
5 ^( W% e1 K$ O3 \3 X6 c& xvirilization, exposure to exogenous testosterone in% P8 e' X# i+ x" Y! p; ^+ T; W
children results in an increase in growth velocity and
3 J. e* S e5 i' |. J/ d5 Ladvanced bone age, as seen in our patient.. i$ `+ v" a6 i" m& y. k4 q
The long-term effect of androgen exposure during
# i, w" V' ~% C1 u4 xearly childhood on pubertal development and final5 g0 W4 }' G$ K% k; A1 c
adult height are not fully known and always remain
# i$ F& {0 @7 l( J5 ?3 Aa concern. Children treated with short-term testos-
4 `# E ~% p! ?1 U7 q0 N' u; }terone injection or topical androgen may exhibit some
e9 e; T$ N- A# E3 l) |: ~acceleration of the skeletal maturation; however, after
) h6 g g7 Z: c" S( K9 f4 G1 Pcessation of treatment, the rate of bone maturation- L1 U& F( G1 |0 X- p9 j" X6 j; ~7 O" K
decelerates and gradually returns to normal.8,9, P1 ?, V/ D7 w2 i4 q# h
There are conflicting reports and controversy
/ ^9 n; e# p& i. L% N# Yover the effect of early androgen exposure on adult, j1 G, r4 E9 ~- d
penile length.10,11 Some reports suggest subnormal6 y# ?8 \; l% o! q4 V4 g
adult penile length, apparently because of downreg-) _2 Y+ ~% O# a' t+ [; r" t+ W
ulation of androgen receptor number.10,12 However,
% Y3 p( u9 C! g2 G! M- x: iSutherland et al13 did not find a correlation between F1 G) l3 l- J6 q
childhood testosterone exposure and reduced adult
+ n- V% w/ v5 G5 U7 G( {penile length in clinical studies.
4 |0 h* u3 Y, H R/ @Nonetheless, we do not believe our patient is8 K/ H& G( U9 t# b1 C3 s; I' z
going to experience any of the untoward effects from4 D9 o8 ^& N7 n5 p2 o* q, v# U
testosterone exposure as mentioned earlier because
( c( e8 V; q% ~9 l- A6 T$ dthe exposure was not for a prolonged period of time.
- [# N4 s+ `( ?" Q* q' l6 JAlthough the bone age was advanced at the time of! e! ^1 L" s+ r; \
diagnosis, the child had a normal growth velocity at( ^, [) a; ^6 X q7 ?
the follow-up visit. It is hoped that his final adult) L+ C& L l* `
height will not be affected.
$ J* L+ T% U% h+ l: s3 QAlthough rarely reported, the widespread avail-5 X' Q, P% S3 k+ W+ S- V6 L- x
ability of androgen products in our society may
5 p9 K4 i# f: a9 m! d- kindeed cause more virilization in male or female, q' C" K# i. N( Q- Y& J, D) V
children than one would realize. Exposure to andro-
8 j" ^7 Z; u+ a5 l8 `' c9 Mgen products must be considered and specific ques-
& |* V0 `9 n9 W* ~- }tioning about the use of a testosterone product or# e. F( Q8 J3 p/ l' ^7 B8 Y
gel should be asked of the family members during
' B) n3 T0 T% H# ~7 E% ?the evaluation of any children who present with vir-
# q4 g5 i2 N: V# filization or peripheral precocious puberty. The diag-
& j F; d) o/ F) h1 ^! Cnosis can be established by just a few tests and by" P: V y3 B6 `! q
appropriate history. The inability to obtain such a
: g- R/ p1 d3 N( K7 ?& ghistory, or failure to ask the specific questions, may
6 U! d+ N/ `( N9 _9 _6 eresult in extensive, unnecessary, and expensive) k# Q/ ~4 _- ]# ~ f/ O
investigation. The primary care physician should be
: G" { c9 `1 ] Naware of this fact, because most of these children
: \% i0 A1 {3 C# I0 l+ R* b* Fmay initially present in their practice. The Physicians’8 v* q7 A' {% [0 k2 l. _
Desk Reference and package insert should also put a
! J) t! W; o! w6 {) b4 L2 m6 gwarning about the virilizing effect on a male or' c2 D/ c) @5 i% q$ r0 k" a
female child who might come in contact with some-3 A+ K3 E, F8 |3 E. b
one using any of these products.0 _8 E; O: e3 _) `1 G/ Y# o5 R
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/ r! X. z/ g% w3 Y yand puberty in the male. In: Sperling MA, ed. Pediatric
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2002: 565-628.3 C G0 ]& g$ c& ] a: q! ~
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. M, P: A9 s: V1 |( @" ~' \development in a two-year-old boy induced by topical
6 |- w+ M8 E3 V% Bexposure to testosterone. Pediatrics. 1999;104:e23.# E" s% y* u, [6 }4 U. j+ B) I
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Skeletal Development of the Hand and Wrist. 2nd ed.
; e0 m- p9 a4 Y, p$ k8 ^! S- DStanford, CA: Stanford University Press; 1959.
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