1. Department of Geriatrics Neurology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shanxi, P. R. China
2. Department of Orthopaedics, Graduate School of Inner Mongolia Medical University, Hohhot, Inner Mongolia Autonomous Region, P. R. China
3. Department of Biochemistry, School of Life Sciences, Northwest University, Xi'an, Shanxi, P. R. China
4. Department of Neurology, The Affiliated Hospital of Yan'an University, Yan'an, Shanxi, P. R. China
5. Department of Medical Oncology, Graduate School of Inner Mongolia Medical University, Hohhot, Inner Mongolia Autonomous Region, P. R. China
6. Department of Hematology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shanxi, P. R. China