1. Department of Epidemiology; Mailman School of Public Health; Columbia University Medical Center; New York New York USA
2. Institute of Human Nutrition and Department of Medicine; College of Physicians and Surgeons; Columbia University Medical Center; New York New York USA
3. Division of Epidemiology & Community Health; School of Public Health; University of Minnesota; Minneapolis Minnesota USA
4. Vanderbilt University School of Medicine; Nashville Tennessee USA