[1] Seoul Natl Univ Hosp, Seoul 110744, South Korea
[2] Seoul Natl Univ Hosp, Dept Internal Med, Seoul 110744, South Korea
[3] Seoul Natl Univ Hosp, Cardiovasc Ctr, Seoul 110744, South Korea
[4] US FDA, Silver Spring, MD USA
[5] Seoul Natl Univ, Seoul, South Korea