1. Department of Health and Human Services, National Heart, Lung, and Blood Institute, National Institutes of Health, Building 10, Room B1D416, MSC 1061, 10 Center Dr., Bethesda, MD, USA
2. Department of Clinical Biochemistry, Rigshospitalet, 9 Blegdamsvej, Copenhagen, Denmark
3. Hjartavernd (Icelandic Heart Association), Holtasmari 1, Kopavogur, Iceland
4. University of Iceland, Sæmundargata 2, Reykjavik, Iceland
5. University of Pittsburgh Medical Center, Heart and Vascular Institute, 200 Lothrop St., Ste. A349, Pittsburgh, PA, USA
6. St. Francis Hospital, The heart Center, State University of New York at Stony Brook, 100 Port Washington Blvd, Roslyn, NY, USA
7. Laboratory of Epidemiology & Population Science, National Institute on Aging, National Institutes of Health, Department of Health and Human Services, GWY Bldg Rm 2N300, 7201 Wisconsin Ave, Bethesda, MD, USA