1. Department of General Surgery, Peking University Third Hospital, Beijing, China.
2. Department of Maternal and Child Health, School of Public Health, Peking University, Beijing, China.
3. Department of Pathology, Peking University Third Hospital, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China.
4. Information Management and Big Data Center, Peking University Third Hospital, Beijing, China.
5. Institute of Medical Information, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China.