1. From the Departments of General Internal Medicine, Endocrinology, and Metabolic Diseases (W.d.H., C.C.v.d.H., M.W., J.A.R., L.M.H., P.C.N.R.), Human Genetics (J.d.V.-v.d.W.), and Cardiology (J.W.A.v.d.H., L.M.H., J.W.J.), Leiden University Medical Center, Leiden; Netherlands Organization for Applied Scientific Research–Biosciences, Gaubius Laboratory, Leiden (J.d.V.-v.d.W., J.W.A.v.d.H., L.M.H., H.M.G.P.); and Center for Liver, Digestive, and Metabolic Diseases, Department of Pediatrics, University...