Shaan Khurshid, MD, MPH1,2; Jeffrey M. Ashburner, PhD, MPH3,4; Patrick T. Ellinor, MD, PhD1,2; David D. McManus, MD, MSc5; Steven J. Atlas, MD, MPH3,4; Daniel E. Singer, MD3,4; Steven A. Lubitz, MD, MPH1,2 Article Information JAMA Netw Open. 2023;6(2):e2255838. doi:10.1001/jamanetworkopen.2022.55838 1 a cluster-randomized trial of AF screening among individuals 65 years or older within 16 Massachusetts General Hospital primary care practices.