Wen-Ping Wang is a Professor and Chief at the Department of Ultrasound, Zhongshan Hospital affiliated to Fudan University, Shanghai, China. Yi Dong is a Professor at the same department with Wen-Ping Wang. Christoph F. Dietrich is a Professor at Department Allgemeine Innere Medizin (DAIM), Kliniken Hirslanden Beau Site, Salem und Permancence, Bern, Switzerland. Ernst-Michael Jung is a Professor at Institut für Röntgendiagnostik, Universitätsklinikum Regensburg, Regensburg, Germany.