1. Department of Internal Medicine; Peking Union Medical College Hospital; Peking Union Medical College and Chinese Academy of Medical Sciences; Beijing China
2. Department of General Internal Medicine; The University of Texas, MD Anderson Cancer Center; Houston TX USA
3. Institute for Technology Assessment; Massachusetts General Hospital; Boston MA USA
4. Harvard Medical School; Boston MA USA
5. Liver Center and Gastrointestinal Division; Massachusetts General Hospital; Boston MA USA