Liu Yanming1,Wang Chunyang2,Liang Xiaobao1,Wang Yating2, Wang Qi3,Hu Zhiyong2,Wei Fei3
1 Wuning Center for Disease Control and Prevention, Jiujiang 332300, China;
2 School of Public Health, Binzhou Medical University, Yantai 264003, China;
3 School of Health Management, Binzhou Medical University, Yantai 264003, China