共 8 条
[1]
BODSWORTH NJ, 1994, GENITOURIN MED, V70, P206
[7]
van Beek I, 1998, BMJ-BRIT MED J, V317, P433, DOI 10.1136/bmj.317.7156.433
[8]
VLAHOV D, 1993, EUR J EPIDEMIOL, V9, P566, DOI 10.1007/BF00209538