1. Department of Epidemiology, School of Public Health, Boston University, Boston, Massachusetts
2. Department of Clinical Laboratory and Nutritional Sciences, College of Health Sciences, University of Massachusetts Lowell, Lowell, Massachusetts
3. Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark
4. Division of Risk Assessment and Nutrition, National Food Institute, Technical University of Denmark, Søborg, Denmark
5. RTI Health Solutions, Research Triangle Park, North Carolina