Dietary diversity and frailty among older Chinese people: evidence from the Chinese Longitudinal Healthy Longevity Study

Xiaomeng Wang, Wen-Fang Zhong, Zhihao Li, Peiliang Chen, Yujie Zhang, Jiaojiao Ren, Dan Liu, Qiaoqiao Shen, Pei Yang, Wei-Qi Song, Fen Liang, Ying Nan, Jia-Xuan Xiang, Yin-Ru Wu, Yuebin Lv, Xiang Gao, Virginia B. Kraus, Xiaoming Shi, Chen Mao