1. The GastrounitCopenhagen University Hospital HvidovreHvidovreDenmark
2. Center for Clinical Research and PreventionBispebjerg and Frederiksberg HospitalCopenhagenDenmark
3. Department of Epidemiology ResearchStatens Serum InstitutCopenhagenDenmark
4. NNF Center for Basic Metabolic ResearchUniversity of CopenhagenCopenhagenDenmark