1. Department of gerontology, Gansu Provincial Maternity and Child-care Hospital (Gansu Provincial Central Hospital)
2. The First Department of Cardiology, Gansu Provincial People's Hospital
3. The First Affiliated Hospital of Jinan University
4. Department of Anesthesiology, Second Clinical Hospital of Lanzhou University
5. The First School of Clinical Medicine, Lanzhou University
6. The First Department of Radiotherapy, Gansu Provincial People's Hospital
7. School of Stomatology, Lanzhou University