共 7 条
[1]
CLARKE A, 1988, LANCET, V1, P1168
[2]
DEAN G, 1988, LANCET, V1, P587
[6]
Martin G M, 1978, Birth Defects Orig Artic Ser, V14, P5
[7]
SMITH CAB, 1953, J R STAT SOC B, V15, P153