Investigation of Anticoagulation Strategies in Nonvalvular Atrial Fibrillation Patients Aged 80 and Over 
CHEN Jingwen,PEI Linghua,CHEN Chao,WANG Shen,HUANG Shuwei
Chinese General Practice . 2020, (35): 4477 -4482 .  DOI: 10.12114/j.issn.1007-9572.2020.00.565