1. Department of Emergency Medicine, Qingdao Municipal Hospital Group, Qingdao, Shandong, China (mainland)
2. Department of Geriatrics, Qingdao Municipal Hospital Group, Qingdao, Shandong, China (mainland)
3. Department of Cardiovascular Medicine, Qingdao Municipal Hospital Group, Qingdao, Shandong, China (mainland)