[1
]
Department of Geriatrics, Shandong University of Traditional Chinese Medicine, Jinan,
250021, People's Republic of China.
[2
]
Department of Spine, Shandong Provincial Hospital Affiliated To Shandong University,
Jinan, 250022, People's Republic of China.
[3
]
Department of Spine, The Second Affiliated Hospital of Shandong University of Traditional
Chinese Medicine, Jingba Road, Jinan, Shandong Province, People's Republic of China.
spine2000@msn.cn.