1. Department of Neurosurgery, The Second Affiliated Hospital of Kunming Medical University, Kunming, Yunnan 650101, P.R. China
2. Department of Neurosurgery, Puer People's Hospital, Pu'er, Yunnan 665000, P.R. China
3. Department of Vasculocardiology, The Affiliated Hospital of Yunnan University, Kunming, Yunnan 650021, P.R. China