1 Division of Endocrinology, Diabetes and Nutrition, St Luke's-Roosevelt Hospital Centre, 1111 Amsterdam Avenue, Room 1020, New York, NY 10025, USA.
2 Endocrine Research Unit, 5-194 Joseph Building, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA.
3 Pennington Biomedical Research Centre, 625 St Charles Avenue, New Orleans, LA 70130, USA.
4 Section of Endocrinology, Diabetes, and Nutrition, Boston University School of Medicine, 88 East Newton Street, Robinson 4400, Boston, MA 02118, USA.
5 Millennium Prevention Boston Nutrition Foundation, PO Box 311, Westwood, MA 02090, USA.
6 Bureau of Chronic Disease Prevention and Tobacco Control, New York City Department of Health and Mental Hygiene, Gotham Centre, 42-09 28th Street, 9th floor, CN 46, New York, NY 11101, USA.