Xu, QuanFu, Department of Cardiology, Xinhua Hospital A ffiliated to Shanghai Jiaotong University School of Medicine, Shanghai, China Xu, Rende Xu, Tongshun Xu, Wei, Tongji Hospital, Tongji University School of Medicine Xu, Xinye Xu, Yang Xu, Yu, Department of Cardiology, Zhengzhou University People’s Hospital (Henan Provincial People’s Hospital), Zhengzhou, Henan, China Xu, Yu (China) Xu, Yu-Fen Xu, Yuan-Ning, West China Hospital, Sichuan University Xu, Yuchen, Department of Echocardiography, Zhongshan Hospital, Fudan University, Shanghai Institute of Cardiovascular Diseases, Shanghai Institute of Medical Imaging, 180 Fenglin Road, Shanghai, China Xu-ping, Li Xue, Jian-fang Xue, Ning, Qingdao Municipal Health and Family Planning Science and Technology Education Center Xue, Qiao, Institute of Geriatric Cardiology, Chinese PLA General Hospital, Beijing, China Xue, Yangjing, The Second Hospital of Wenzhou Medical University Xue, Yuan Xue, Yuguo Xylomenos, George Yaegashi, Taku Yaghoubi, Alireza Yahav-Shafir, Dana Yakar, Fatih, Bezmi Alem University,School of Medicine, Department of Pulmonary Medicine, İstanbul,Turkey Yakar, Tolga Yakar Tuluce, Selcen, Ataturk Training and Research Hospital, Department of Cardiology, Izmir, Turkey