1. Division of Cardiology, Department of Medicine, Hennepin County Medical Center, Minneapolis, USA
2. Department of Emergency Medicine, Hennepin County Medical Center, Minneapolis, USA
3. Cardiac Biomarkers Trials Laboratory, Minneapolis Medical Research Foundation, Hennepin County Medical Center, Minneapolis, USA
4. Biostatistics Consultant, Minot, USA
5. Department of Laboratory Medicine and Pathology, Hennepin County Medical Center and University of Minnesota, Minneapolis, USA