1. Division of Cardiovascular Medicine, Department of Internal Medicine; University of Toledo Medical Center; 3000 Arlington Avenue, Toledo OH 43614 USA
2. Statistics Collaborative, Inc.; Washington DC USA
3. Stavanger University Hospital; Stavanger Norway
4. University of Glasgow; Glasgow UK
5. University of Michigan School of Medicine; Ann Arbor MI USA
6. Centre d'Investigation Clinique Pierre Drouin; INSERM; CHU de Nancy France
7. Division of Cardiovascular Medicine, Department of Internal Medicine; Brigham and Women's Hospital; Boston MA USA