1. Department of Respiratory Medicine Kanagawa Cardiovascular and Respiratory Center Yokohama Kanagawa Japan
2. Department of Internal Medicine, Mito Medical Center University of Tsukuba Mito Japan
3. Department of Biostatistics Yokohama City University School of Medicine Yokohama Japan
4. Department of Radiology Kanagawa Cardiovascular and Respiratory Center Yokohama Kanagawa Japan