[1] Univ Copenhagen, Gentofte Hosp, Dept Med, Diabet Res Div, Hellerup, Denmark
[2] Univ Catania, Dept Clin & Mol Biomed, Catania, Italy
[3] Univ Copenhagen, Panum Inst, Dept Biomed Sci, Novo Nordisk Fdn,Ctr Basic Metab Res, DK-2200 Copenhagen, Denmark
[4] Columbia Univ Coll Phys & Surg, St Lukes Roosevelt Hosp Ctr, Obes Nutr Res Ctr, New York, NY 10032 USA