Use of video-based telehealth services using a mobile app for workers in underserved areas during the COVID-19 pandemic: A prospective observational study. - Hyun Sang Park; Sungmoon Jeong; Ho Young Chung; Jae Young Soh; Young Ho Hyun; Seong Hwan Bang; Hwa Sun Kim (Int. J. Medical Informatics, 2022)