1. Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong;
2. Department of Neurosurgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong;
3. Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong; and
4. Department of Clinical Nutrition, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China