The prevalence of multi⁃morbidity and related functional limitation among middle⁃aged and senior popula⁃ tion in China：nationally evidence from CHARLS 2018

LIU Shuaishuai, ZHANG Luwen, LU Qiaochu, LIU Huanlan
The Journal of Practical Medicine . 2021, (4): 518 -524 .  DOI: 10.3969/j.issn.1006⁃5725.2021.04.020