ty -jour au -rutgeerts，py -py -1990 da -1900/01/01 ti-胃肠道出血的方法 - 何时治疗？SP -187323 VL -4 AB -SN -SN -2291-2789 UR -https：//doi.org/10.1155/1990/187323 DO -10.1155/1990/1990/1990/197323 JF -CANADIAN of CANADIAN of CANADIAN of CANADIAN of CANADIAN of CANADIAN of GATERONTEROLOGY PULSOLOGY PB -PULSOLOGY GLOUP KW -ER -ER -ER -ER -ER-- ER-- ER-