Influenza vaccination rate and its association with chronic diseases in China: Results of a national cross-sectional study

Jing Fan, Shu Cong, Ning Wang, Heling Bao, Baohua Wang, Yajing Feng, Xueli Lv, Yang Zhang, Zhenqiu Zha, Lianzheng Yu, Ting Yang, Lınhong Wang, Liwen Fang