共 4 条
[1]
FRANK BB, 1984, GASTROINTEST ENDOSC, V30, P172
[2]
ARE WE TRAINING TOO MANY MEDICAL SUBSPECIALISTS
[J].
JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION,
1988, 259 (02)
:233-239
[4]
1990, DATA NATIONAL STUDY