1. Department of Communication Disorders; School of Rehabilitation Science; Health Sciences University of Hokkaido; Hokkaido Japan
2. Department of Rehabilitation Medicine I; School of Medicine; Fujita Health University; Toyoake Japan
3. Graduate School of Comprehensive Human Sciences; University of Tsukuba; Tokyo Japan
4. Division of Comprehensive Prosthodontics; Niigata University Graduate School of Medical and Dental Sciences; Niigata Japan