1. The General Hospital of the People's Liberation Army Beijing P.R. China
2. Department of Biochemistry and Molecular Biology Center for DNA Typing, Air Force Medical University Xi'an Shaanxi P.R. China
3. Shaanxi Institute of Pediatric Diseases, Xi’an Children’s Hospital Xi’an Shaanxi P.R. China
4. Department of General Surgery Tangdu Hospital, Air Force Medical University Xi’an Shaanxi P.R. China