[1] Harbin Med Coll, Dept Neurosurg, Affiliated Hosp 4, Harbin 150001, Peoples R China
[2] Tonghua Municipal Peoples Hosp, Dept Neurosurg, Tonghua 134001, Peoples R China
[3] Harbin Med Coll, Dept Pathophysiol, Harbin 150001, Peoples R China
[4] Harbin Med Coll, Dept Clin Lab, Affiliated Hosp 4, Harbin 150001, Peoples R China
[5] Klinikum Augsburg, Dept Neurosurg, D-86156 Augsburg, Germany