Shen-Kou Tsai is a Professor at the Department of Anesthesiology, Cheng Hsin General Hospital, and National Taiwan University Hospital, Taipei,Taiwan. He is also the Honor President of Taiwan Society of Echocardiography. Jou-Kou Wang is Professor at the Department of Pediatrics, National Taiwan University Hospital, Taipei, Taiwan. Shyh-Jye Chen is Professor at the Department of Medical imaging, National Taiwan University Hospital, Taipei, Taiwan.