1 Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 223, 5th Engineering Building 77 Cheongam-ro, Nam-Gu, Pohang, Gyeongbuk 37673, Republic of Korea. Electronic address: jjeon@postech.ac.kr.
2 Department of Rehabilitation Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.
3 Department of Rehabilitation Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea. Electronic address: rootpmr@catholic.ac.kr.
4 Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 223, 5th Engineering Building 77 Cheongam-ro, Nam-Gu, Pohang, Gyeongbuk 37673, Republic of Korea. Electronic address: seunglee@postech.ac.kr.
5 Department of Rehabilitation Medicine, Bucheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, 327, Sosa-ro, Bucheon-si, Gyeonggi-do 14647, Republic of Korea. Electronic address: lafolia@catholic.ac.kr.