1. Department of Cardiovascular Medicine; Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences; Okayama Japan
2. Division of Cardiac Intensive Care Unit; Okayama University Hospital; Okayama Japan
3. Division of Cardiovascular Medicine; Fukuyama Cardiovascular Hospital; Fukuyama Japan
4. Division of Central Clinical Laboratory; Okayama University Hospital; Okayama Japan
5. Department of Cardiovascular Surgery; Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences; Okayama Japan