[1] Xi An Jiao Tong Univ, Sch Med, Xian, Shaanxi, Peoples R China
[2] Univ San Francisco Quito, Sch Med, Quito, Ecuador
[3] King Saud Bin Abdulaziz Univ Hlth Sci, Coll Appl Med Sci, Emergency Med Serv Program, Al Hasa, Saudi Arabia
[4] King Abdullah Int Med Res Ctr, Al Hasa, Saudi Arabia
[5] Minist Natl Guard Hlth Affairs, Al Hasa, Saudi Arabia
[6] Univ New England, Sch Hlth, Armidale, NSW, Australia
[7] Univ Gondar, Dept Internal Med, Addis Ababa, Ethiopia
[8] Combined Mil Hosp, Dept Radiol, Peshawar, Pakistan
[9] Xi An Jiao Tong Univ, Affiliated Hosp 2, Dept Cardiol, Xian, Shaanxi, Peoples R China