隐匿性消化道出血的病因和诊断分析杨林袁爱力张振书周殿元Ｓｕｂｊｅｃｔｈｅａｄｉｎｇｓｇａｓｔｒｏｉｎｔｅｓｔｉｎａｌｈｅｍｏｒｈａｇｅ／ｅｔｉｏｌｏｇｙ；ｇａｓｔｒｏｉｎｔｅｓｔｉｎａｌｈｅｍｏｒｈａｇｅ／ｄｉａｇｎｏｓｉｓ；ｓｔｏｍａｃｈｄｉｓｅ... Etiology and diagnostic analysis of occult gastrointestinal......