共 25 条
[1]
BULPITT CJ, 1987, LANCET, V1, P494
[2]
BURROUGHS AK, 1988, GUT, V29, pA1495
[4]
CHOJKIER M, 1979, GASTROENTEROLOGY, V77, P540
[5]
Diem K., 1970, DOCUMENTA GEIGY SCI
[6]
DOMBAL FT, 1986, ENDOSCOPY, V18, P6
[8]
FLEISS JL, 1981, STATISTICAL METHODS, P26