1. The Affiliated Hospital of Guizhou Medical University, Guiyang, Guizhou, China
2. The First Affiliated Hospital of the Medical College of Xi’an Jiaotong University, Xi’an, Shaanxi, China
3. People's Hospital of Shaanxi Province, Xi’an, Shaanxi, China
4. Northwest Women's and Children's Hospital, Xi’an, Shaanxi, China
5. Institute of Medical Science of Guizhou Medical University, Guiyang, Guizhou, China