1 Department of Nursing, The Affiliated Northwest Women's and Children's Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi 710061, China.
2 Xinjiang Institute of Pediatrics, People's Hospital of Xinjiang Uygur Autonomous Region, Urumqi, Xinjiang 830000, China.
3 Department of Pediatric Surgery, the Northwest Women's and Children's Hospital, Xi'an, Shaanxi 710061, China.
4 Third Department of General Surgery, School of Medicine, Shihezi University, Shihezi, Xinjiang 832002, China.
5 Department of Basic Surgery, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China.