1 Academic Center for Congenital Heart Disease, Department of Pediatric Cardiology, Amalia Children's Hospital, Radboud University Medical Center, Nijmegen, The Netherlands (F.E.A.U.t.C.).
2 Division of Pediatric Cardiology, Department of Pediatrics, Sophia Children's Hospital, Erasmus Medical Center, Rotterdam, The Netherlands (F.E.A.U.t.C.).
3 The Nijmegen Fontan Initiative, Radboud University Medical Center, The Netherlands (F.E.A.U.t.C., E.T.T.L.T.).
4 Department of Gastroenterology and Hepatology, Radboud University Medical Center, Nijmegen, The Netherlands (E.T.T.L.T.).