Effects of Chronic Disease Burden on Anxiety and Depression in Elderly Patients 
ANG Zhen1,2,SUN Jing3,ZHANG Youyang1,LI Yuhang1,MA Xiaoyu1,MA Wenlin1,3,LU Lijuan3*
Chinese General Practice . 2020, (23): 2923 -2926 .  DOI: 10.12114/j.issn.1007-9572.2019.00.664