1. Research Institute of Clinical Medicine of Jeonbuk, National University–Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju-si, Jeollabuk-do 561-712, Republic of Korea
2. Division of Biomedical Engineering, College of Engineering, Jeonbuk National University, Jeonju-si, Jeollabuk-do 54896, Republic of Korea