Adult Congenital Heart Disease Program at Stanford, Lucile Packard Children's Hospital and Stanford Health Care, Palo Alto, CA, USA.; KU Leuven Department of Public Health and Primary Care, KU Leuven - University of Leuven, Kapucijnenvoer 35, Box 7001, B-3000, Leuven, Belgium. philip.moons@kuleuven.be.; Adult Congenital Heart Disease Center, Helen DeVos Children's Hospital, Grand Rapids, MI, USA.; Center for Biobehavioral Health, Nationwide Children's Hospital, Columbus, OH, USA.; Department of Health Sciences, University West, Trollhättan, Sweden.; Monash Heart, Monash Medical Centre, Monash University, Melbourne, Australia.; Adult Congenital Heart Disease Center University of Nebraska Medical Center/ Children's Hospital and Medical Center, Omaha, NE, USA.; Clinical Psychology Service, IRCCS Policlinico San Donato, Milan, Italy.; Research Foundation Flanders, Brussels, Belgium.; Department of Adult Congenital Heart Disease, Chiba Cardiovascular Center, Chiba, Japan.; Department of PuAdult Congenital Heart Disease Program at Stanford, Lucile Packard Children's Hospital and Stanford Health Care, Palo Alto, CA, USA.; KU Leuven Department of Public Health and Primary Care, KU Leuven - University of Leuven, Kapucijnenvoer 35, Box 7001, B-3000, Leuven, Belgium. philip.moons@kuleuven.be.; Adult Congenital Heart Disease Center, Helen DeVos Children's Hospital, Grand Rapids, MI, USA.; Center for Biobehavioral Health, Nationwide Children's Hospital, Columbus, OH, USA.; Department of Health Sciences, University West, Trollhättan, Sweden.; Monash Heart, Monash Medical Centre, Monash University, Melbourne, Australia.; Adult Congenital Heart Disease Center University of Nebraska Medical Center/ Children's Hospital and Medical Center, Omaha, NE, USA.; Clinical Psychology Service, IRCCS Policlinico San Donato, Milan, Italy.; Research Foundation Flanders, Brussels, Belgium.; Department of Adult Congenital Heart Disease, Chiba Cardiovascular Center, Chiba, Japan.; Department of Pu