共 7 条
[1]
[Anonymous], 1990, BMJ, V301, P797
[2]
BUCKNALL CE, 1992, THORAX, V47, P884
[3]
Dean A. G., 1990, EPI INFO VERSION 5 W
[4]
PEARSON MG, 1992, THORAX, V47, pP209
[5]
UDWADIA ZF, 1990, J ROY COLL PHYS LOND, V24, P112
[7]
1993, THORAX, V48, pS1