1. Pain Department of the First Affiliated Hospital China Medical University Shenyang China
2. Pain Department of the Central Hospital of Haicheng city Anshan China
3. Pain Department of the Third People's Hospital of Anshan city Anshan China
4. Pain Department of the Central Hospital of Fuxin city Fuxin China
5. Pain Department of the Women and Children's Hospital of Dandong city Dandong China
6. Pain Department of the Central Hospital of Kuandian city Dandong China