1. Department of Speech-Language Pathology, Graduate School of Health and Sciences, Hallym University, Chuncheon, Korea
2. Department of Communication Sciences and Disorder, Ohio University, Athens, OH, USA
3. Department of Rehabilitation Medicine, Ewha Woman’s University Seoul Hospital, Ewha Woman’s University School of Medicine, Seoul, Korea
4. Department of Rehabilitation Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea