1. Department of Dysphagia Rehabilitation, Division of Gerontology and Gerodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8510, Japan
2. School of Nursing, College of Nursing and Nutrition, Shukutoku University, Chiba 260-8703, Japan
3. Department of Pediatrics, Tokyo-Kita Medical Center, Tokyo 115-0053, Japan
4. Cancer/Advanced Adult Nursing, Department of Nursing, Graduate School of Medicine, Yokohama City University, Yokohama 236-0004, Japan