共 36 条
[14]
HEWITT D, 1971, BRIT J PREV SOC MED, V25, P174
[15]
JOLLY H, 1985, DISEASES CHILDREN, P133
[16]
KENNA AP, 1975, Q J MED, V44, P17
[18]
LAURENCE KM, 1967, BR J PREV SOC MED, V21, P146
[19]
LECK I, 1966, LANCET, V2, P457
[20]
LECK I, 1966, BRIT J PREV SOC MED, V20, P67