Joon-Hyung Doh, MD, PhD1*; Chang-Wook Nam, MD, PhD2*; Bon-Kwon Koo, MD, PhD3; Sang Hyun Park, MD4; Ju-Hee Lee, MD5; Jung-Kyu Han, MD, PhD3; Hyoung-Mo Yang, MD3; Hong-Seok Lim, MD, PhD6; Myeong-Ho Yoon, MD, PhD6; Yun-Kyeong Cho, MD, PhD2; Seung-Ho Hur, MD, PhD2; Sung Yun Lee, MD, PhD1; Hyo-Soo Kim, MD, PhD3; Seung-Jea Tahk, MD, PhD6