1. Department of Neurosurgery, The First People's Hospital of Yancheng, Fourth Affiliated Hospital of Nantong University, Yancheng, Jiangsu 224001, P.R. China
2. Department of Medical Oncology, The Eighty‑First Hospital of People's Liberation Army, Nanjing, Jiangsu 210002, P.R. China
3. Department of Ear‑Nose‑Throat, Huai'an Second People's Hospital, The Affiliated Huai'an Hospital of Xuzhou Medical University, Huai'an, Jiangsu 223002, P.R. China
4. Department of Neurosurgery, Jiangning Hospital Affiliated with Nanjing Medical University, Nanjing, Jiangsu 211100, P.R. China