1. From the Departments of Cardiology (W.M.A., N.A., A.A.-Q.) and Research (R.S.), Hamad Medical Corp, Qatar; King Fahad Cardiac Center, King Khalid University Hospital, College of Medicine, Riyadh, Saudi Arabia (K.F.A.H., A.H.); Security Forces Hospital, Riyadh, Saudi Arabia (H.A.F.); Saud AlBabtain Cardiac Center, Dammam, Saudi Arabia (S.A.S.); Faculty of Medicine, Sana's University, Sana'a, Yemen (A.A.-M.); Department of Cardiology, Sheikh Khalifa Medical City, Abu Dhabi, United Arab Emirates (W.A.,...