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References
1.
2.
Gey
K.F.
Brubacher
G.B.
Stahelin
H.B.
Ibid. 45 : 1368 (1987 ).
3.
Knekt
P.
, et al., Ibid. 53 : 283S (1991 ).
4.
Gey
K.F.
Phska
P.
Jordan
P.
Moser
U.K.
Ibid. 53 : 3268 (1991 ).
5.
Riemeroma
R.A.
Wood
D.A.
Macintyre
C.C.
Elton
R.A.
Gey
K.F.
Oliver
M.E.
. Lancet
337 :1 (1991 ).