1. Department of Internal Medicine; University of Pittsburgh Medical Center; Pittsburgh PA 15213 USA
2. Department of Nutritional Sciences; University of Toronto; Ontario Canada
3. Department of Cardiology; Veterans Affairs Pittsburgh Health Care System; Pittsburgh PA USA
4. Department of Global Health, Rollins School of Public Health; Emory University; Atlanta GA USA
5. Department of Cardiology; University Medical Center Groningen, University of Groningen; The Netherlands
6. Institute of Metabolic Science, Addenbrooke's Hospital; Cambridge UK