Treatment group

Control Group

Wuhan, Xianning, Yueyang, Changsha, Zhuzhou, Hengyang, Chenzhou, Shaoguan, Qingyuan, Guangzhou

Xiangtan, Yiyang, Changde, Shaoyang, Zhangjiajie, Loudi, Jingmen, Huanggang, Shantou, Foshan, Zhanjiang, Maoming, Zhaoqing, Meizhou, Heyuan, Yangjiang, Chaozhou, Jieyang