共 6 条
[1]
Chamberlain G, 1978, BRIT BIRTHS 1970
[2]
Cochrane A.L, 1972, EFFECTIVENESS EFFICI, DOI DOI 10.1016/S0033-3506(73)80082-4
[3]
LEATHER HM, 1968, LANCET, V2, P488
[5]
REDMAN CWG, 1976, LANCET, V2, P753