共 12 条
[2]
AUSTRIAN R, 1963, T ASSOC AM PHYSICIAN, V76, P117
[4]
CALDER MA, 1970, LANCET, V1, P5
[5]
CYBULSKA J, 1971, EPID REV, V25, P77
[6]
Heffron R, 1939, PNEUMONIA SPECIAL RE
[9]
LUND E, 1971, 3 BAYER S, P49