Quarterly versus annual ECG screening for atrial fibrillation in older Chinese individuals (AF-CATCH): a prospective, randomised controlled trial oleh Wei Zhang, MD, Yi Chen, PhD, Chao-Ying Miao, MD, Qi-Fang Huang, PhD, Chang-Sheng Sheng, PhD, Shuai Shao, PhD, Dian Wang, PhD, Shao-Kun Xu, PhD, Lei Lei, MD, Di Zhang, MD, Yi-Lin Chen, MD, Lei-Xiao Hu, MD, Jia-Hui Xia, MD, Xiao-Fei Ye, MSc, Yi-Bang Cheng, PhD, Ying Wang, MD, Qian-Hui Guo, PhD, Yan Li, ProfPhD, Nicole Lowres, PhD, Ben Freedman, ProfPhD, Ji-Guang Wang, ProfPhD