1. Department of Neurosurgery, Stroke Center, Sapporo Teishinkai Hospital, Sapporo, Hokkaido, Japan;
2. Department of Neurosurgery, National Brain Center Hospital Prof. Dr. dr. Mahar Mardjono, Jakarta, Indonesia;
3. Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA