Prevalence and Influencing Factors of Visiting Primary Healthcare Institutions in 16 Districts of Beijing 
GUO Ran,HU Linlin,LIU Meicen,WANG Huanqian,CHEN Xinyue,QIAN Jie,LIU Yuanli
Chinese General Practice . 2021, (7): 824 -828 .  DOI: 10.12114/j.issn.1007-9572.2020.00.478