1. Department of Pathology The Affiliated Second Hospital Mudanjiang Medical University Mudanjiang Heilongjiang China
2. Department of Obstetrics Gynecology Peking University People's Hospital Beijing China
3. Department of Anesthesiology The Affiliated Second Hospital Mudanjiang Medical University Mudanjiang Heilongjiang China
4. Department of Gerontology The Affiliated Second Hospital Mudanjiang Medical University Mudanjiang Heilongjiang China
5. Department of Nursing The Affiliated Second Hospital Mudanjiang Medical University Mudanjiang Heilongjiang China
6. Department of Medical Imaging Mudanjiang Medical University Mudanjiang Heilongjiang China
7. Department of Oncology The Affiliated Hongqi Hospital, Mudanjiang Medical University Mudanjiang Heilongjiang China