1. Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, Gifu, Japan;
2. Department of Preventive Medicine, Nagoya University Graduate School of Medicine, Nagoya, Japan;
3. Department of Surgery, Kumiai Kosei Hospital, Takayama, Japan;
4. Department of Internal Medicine, Takayama Red Cross Hospital, Takayama, Japan;
5. Department of Radiology, Takayama Red Cross Hospital, Takayama, Japan