1. Central Radiology Department, Aichi Medical University Hospital, Nagakute, Aichi, Japan
2. Department of Radiology, Division of Medical Technology, Nagoya University Hospital, Nagoya, Aichi, Japan
3. Brain and Mind Research Center, Division of Infrastructure Development, Nagoya University, Nagoya, Aichi, Japan
4. Department of Neurosurgery, Aichi Medical University, Nagakute, Aichi, Japan