Jeong HC, Ahn Y, Jeong MH, Chae SC, Hur SH, Hong TJ, Kim YJ, Seong IW, Chae JK, Rhew JY, Chae IH, Cho MC, Bae JH, Rha SW, Kim CJ, Choi D, Jang YS, Yoon J, Chung WS, Cho JG, Seung KB, Park SJ, Other Korea Acute Myocardial Infarction Registry Investigators