First-Generation Versus Second-Generation Drug-Eluting Stents in Coronary Chronic Total Occlusions: Two-Year Results of a Multicenter Registry. oleh Jong-Hwa Ahn, Jeong Hoon Yang, Cheol Woong Yu, Je Sang Kim, Hyun Jong Lee, Rak Kyeong Choi, Tae Hoon Kim, Ho Joon Jang, Young Jin Choi, Young Moo Roh, Won-Heum Shim, Young Bin Song, Joo-Yong Hahn, Jin-Ho Choi, Sang Hoon Lee, Hyeon-Cheol Gwon, Seung-Hyuk Choi