共 17 条
[3]
Bramstedt KA, 2004, CLIN INVEST MED, V27, P129
[4]
*COCHR COLL, 2001, COCHR REV HDB
[5]
Dillman DA, 2000, Mail and internet surveys: The tailored design method, V2
[8]
Fowler F., 1988, Survey research methods
[10]
KEVLES DJ, 1998, BALTIMORE CASE TRIAL