共 29 条
[21]
OWEN RL, 1983, GASTROINTESTINAL DIS, P966
[23]
PIOT P, 1984, LANCET, V2, P65
[26]
YIM Y, 1970, J TROP MED HYG, V73, P245
[27]
1982, MORBID MORTAL WEEKLY, V31, P577
[28]
1986, MORBID MORTAL WEEKLY, V35, P17
[29]
1979, MORBID MORTAL WEEKLY, V28, P385