Prevalence and Associated Factors of Depressive Symptoms in China's Rural Elderly 
LI Lei,MA Mengyuan1,PENG Hongye,YAN Zaofang,WANG Miyuan,HU Mengchao,LIU Jia,ZHAO Zhenhai
Chinese General Practice . 2021, (27): 3432 -3438 .  DOI: 10.12114/j.issn.1007-9572.2021.00.577