1. Department of Rehabilitation Sciences, Gunma University Graduate School of Health Sciences: 3-39-22 Showa-machi, Maebashi-shi, Gunma 371-8514, Japan
2. Division of Respiratory Medicine, Gunma Prefectural Cancer Center, Japan
3. Department of Rehabilitation Medicine, Keio University School of Medicine, Japan
4. Division of Rehabilitation, Gunma Prefectural Cancer Center, Japan
5. Nagano University of Health and Medicine, Japan