1Higham J,Kang JY,Majeed A.Recent trends in admissionsandmortality due to peptic ulcer in England:increasing frequencyof haemorrhage among oldersubjects[J].Gut,2002,50(4):460-464.
2Hilton D,Iman N,Burke GJ,et al.Absence of abdominalpaininolder persons with endoscopic ulcers:aprospective study[J].AmJ Gastroenterol,2001,96(2):380-384.
