共 122 条
[6]
[Anonymous], 1987, Lancet, V2, P871
[7]
[Anonymous], 1990, LANCET, V336, P65
[8]
[Anonymous], 1991, BMJ, V302, P555
[9]
[Anonymous], 1988, LANCET, V2, P349
[10]
[Anonymous], 1986, LANCET, V1, P397