1. Department of Pulmonary Medicine, Graduate School of Comprehensive Human Science, University of Tsukuba, Japan
2. Pathology, National Hospital Organization, Ibaraki Higashi National Hospital, Japan
3. Hematology and Oncology Division, Hitachi General Hospital, Japan
4. Department of Urology, Mito Saiseikai General Hospital, Japan
5. Department of Respiratory Medicine, National Hospital Organization, Ibaraki Higashi National Hospital, Japan
6. Clinical Research, National Hospital Organization, Ibaraki Higashi National Hospital, Japan