1. Adult Congenital Heart Disease Program; University Hospital Zurich; Zurich Switzerland
2. Toronto Congenital Cardiac Centre for Adults; Peter Munk Cardiac Centre; Toronto General Hospital; University Health Network; University of Toronto; Toronto Ontario Canada
3. Adult Congenital Heart Disease Clinic; University Hospital Basel; Basel Switzerland
4. Division of Biostatistics; Institute for Social and Preventive Medicine; University of Zurich; Zurich Switzerland
5. Clinical Trials Unit; Kantonsspital St. Gallen; St. Gallen Switzerland
6. Institute for Clinical Evaluative Sciences; Toronto Ontario Canada
7. Department of Cardiovascular Surgery; Hospital for Sick Children; Toronto Ontario Canada