1. Department of Human Biology (J.W.E.J., E.S., W.H.M.S., G.B.H., E.E.B.), Nutrition and Toxicology Research Institute Maastricht, Maastricht University, 6200 MD Maastricht, The Netherlands
2. Obesity Research Unit (D.L., C.V.), Institut National de la Santé et de la Recherche Médicale, Unité 586, F-31432 Toulouse, France
3. Paul Sabatier University (D.L., C.V.), Louis Bugnard Institute, Institut Fédératif de Recherche 31, F-31432 Toulouse, France
4. Centre Hospitalier Universitaire de Toulouse (D.L.), Biochemistry Laboratory, Biology Institute of Purpan, F-31059 Toulouse, France
5. Department of Experimental Medical Science (C.H.), Division of Diabetes, Metabolism, and Endocrinology, Lund University, SE-221 00 Lund, Sweden
6. Department of Medicine (P.A.), Karolinska Institutet, Karolinska University Hospital, Huddinge, SE-141 86 Stockholm, Sweden