1. Department of Endocrinology, Peking University First Hospital , Beijing 100034 , PR China
2. Department of Pediatrics, Peking University First Hospital , Beijing 100034 , PR China
3. Department of Ultrasound, Peking University First Hospital , Beijing 100034 , PR China
4. Animal Center, Peking University First Hospital , Beijing 100034 , PR China
5. Department of Gastroenterology, Peking University First Hospital , Beijing 100034 , PR China
6. Department of Pathology, Peking University First Hospital , Beijing 100034 , PR China