1. Department of Neurology, Toyonaka Municipal Hospital, Toyonaka, Osaka, Japan
2. Department of Neurosurgery, Toyonaka Municipal Hospital, Toyonaka, Osaka, Japan
3. Department of Diagnostic Pathology, Toyonaka Municipal Hospital, Toyonaka, Osaka, Japan
4. Department of Thoracic Oncology, Osaka Toneyama Medical Center, Toyonaka, Osaka, Japan