1. Department of Diagnostic and Generalist Medicine, Dokkyo Medical University Hospital, Mibu, Tochigi 321-0293, Japan; Japanese Red Cross Ashikaga Hospital, Ashikaga, Tochigi, Japan
2. Japanese Red Cross Ashikaga Hospital, Ashikaga, Tochigi, Japan
3. Department of Diagnostic and Generalist Medicine, Dokkyo Medical University Hospital, Mibu, Tochigi 321-0293, Japan