Dr. Yuehua Liu is a Professor and Dean of Shanghai Stomatological Hospital, Fudan University. He got the Ph. D degree in 1996 from Peking University and was a Postdoctoral fellow in the University of British Columbia, Canada from 1998 to 2000. Now he is an Executive Member of the Council and Vice-President of Chinese Orthodontic Society of Chinese Stomatological Association (CSA), Vice-President of Stomatological Group, Chinese Pediatric Society, Chinese Medical Association (CMA), Vice-Director of the Council and Immediately Past President of Shanghai Orthodontic Society of Shanghai Stomatological Association (SSA), a Standing Member of Dentist Society Division and Standing Member of Sleep Medicine Professional Committee, Chinese Medical Doctor Association (CMDA), and an Examiner in Orthodontics, the Royal College of Surgeons of Edinburgh. Professor Liu has been in charge of 6 General Programs of National Natural Science Foundation of China (NSFC), published over 30 peer-reviewed papers on SCI Journals and authorized 4 National Invention patents. In addition, he was awarded the second prize of the advanced science and technology, Ministry of Education, PRC, in 2002 and the second prize of the advanced medical science and technology, Chinese Association of Medicine, PRC, in 2003.