共 8 条
[1]
BEAL S, 1972, MED J AUSTRALIA, V2, P1223, DOI 10.5694/j.1326-5377.1972.tb47540.x
[2]
BEAL SM, 1978, LANCET, V1, P1257
[3]
BONSER R, LANCET, V2, P1379
[4]
FEDRICK J, 1973, BRIT J PREV SOC MED, V27, P217
[7]
JOHNSON AR, 1979, 2ND NATL SIDS WORKSH