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Xian Ninth Hosp, Cardiovasc Hosp, Dept Geriatr 3, 151 East Sect South Second Ring Rd, Xian 710054, Peoples R China Xian Ninth Hosp, Cardiovasc Hosp, Dept Geriatr 3, 151 East Sect South Second Ring Rd, Xian 710054, Peoples R China