1. Department of Neonatal, Xi’an Children’s Hospital, Xi’an, Shaanxi, People’s Republic of China
2. Department of Orthopaedics, The NO. 946 hospital of PLA, Yi-Ning, Xin-Jiang, People’s Republic of China
3. Shaanxi Institute of Pediatric Diseases, Xi’an Children’s Hospital, Xi’an, Shaanxi, People’s Republic of China
4. Department of Clinical Laboratory, Xi’an Children’s Hospital, Xi’an, Shaanxi, People’s Republic of China