1. Department of Radiology, University of Toyama, 2630 Suginani, Toyama, Toyama 930-0194, Japan
2. Department of Radiology, Saiseikai Takaoka Hospital, 387-1 Futazuka, Takaoka, Toyama 933-8525, Japan
3. Department of Surgery, Saiseikai Takaoka Hospital, 387-1 Futazuka, Takaoka, Toyama 933-8525, Japan
4. Department of Respiratory Internal Medicine, Saiseikai Takaoka Hospital, 387-1 Futazuka, Takaoka, Toyama 933-8525, Japan
5. Department of Pathology, Saiseikai Takaoka Hospital, 387-1 Futazuka, Takaoka, Toyama 933-8525, Japan