The association of multimorbidity and disability in a community-based sample of elderly aged 80 or older in Shanghai, China oleh Peng Su, Hansheng Ding, Wei Zhang, Guangfeng Duan, Yitong Yang, Rong Chen, Zengjie Duan, Lixia Du, Chunyan Xie, Chunlin Jin, Chaoqun Hu, Zixue Sun, Junrui Long, Lingling Gong, Wenhua Tian