共 9 条
[3]
FRIEDMAN BA, 1980, STUDY NATIONAL TREND
[5]
1987, JAMA-J AM MED ASSOC, V257, P1777
[6]
1985, JAMA-J AM MED ASSOC, V253, P551
[7]
1980, DHHS PHS801260 DEPT
[8]
1988, JAMA-J AM MED ASSOC, V260, P2700
[9]
1988, DRGS DIAGNOSIS RELAT