共 6 条
[1]
FORMAN D, 1993, LANCET, V341, P1359
[2]
HALCOMBE C, 1992, GUT, V33, P429
[3]
ROBERTSON M A, 1969, South African Medical Journal, V43, P915
[6]
Walker ARP, 1997, NEW ENGL J MED, V337, P199