1. Department of Physical Therapy, School of Health Sciences, Kyorin University: 5-4-1 Shimorenjyaku, Mitaka-shi, Tokyo 181-8612, Japan
2. Division of Respiratory Care, Showa University Graduate School of Nursing and Rehabilitation Sciences, Japan
3. Department of Physical Therapy, Takasaki University of Health and Welfare, Japan
4. Department for Research Team for Human Care, Tokyo Metropolitan Institute of Gerontology, Japan
5. Department of Respiratory Medicine, Kirigaoka Tsuda Hospital, Japan