Corrigendum: Remote Assessment of Post-Stroke Elbow Function Using Internet-Based Telerobotics: A Proof-of-Concept Study - Kim, Jonghyun; Sin, Minki; Kim, Won-Seok; Min, Yu-Sun; Kim, Woojin; Park, Daegeun; Paik, Nam-Jong; Cho, Kyujin; Park, Hyung-Soon (Frontiers in Neurology, 2021)