1. Department of Neurosurgery, Qilu Hospital and Institute of Brain and Brain-Inspired Science, Cheeloo College of Medicine, Shandong University, 107 Wenhua Xi Road, Jinan, Shandong 250012, P. R. China
2. Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, 27 Shanda South Road, Jinan, Shandong 250100, P. R. China
3. Department of Neurosurgery, Chiping District People’s Hospital, 1057 Wenhua Road, Liaocheng, Chiping, Shandong 252100, P. R. China
4. Department of Biomedicine, University of Bergen, Jonas Lies vei 91, 5009 Bergen, Norway