共 7 条
[2]
FAIGEL HC, 1983, J AM COLL HEALTH, V30, P240
[3]
FENNEMA K, 1990, J FAM PRACTICE, V30, P441
[4]
HARR E, 1975, MED CARE, V13, P782
[5]
Lurie N, 1997, J GEN INTERN MED, V12, P34
[6]
*NAT CTR HLTH STAT, 1989, PUBL NAT CTR HLTH ST, P106
[7]
SCHAPPERT S, 1992, OFF VISITS OBSTETRIC