[1] Univ Hosp Leuven, Congenital & Struct Cardiol, Herestr 49, B-3000 Leuven, Belgium
[2] KU Leuven Univ Leuven, Dept Cardiovasc Sci, Leuven, Belgium
[3] KU Leuven Univ Leuven, Dept Publ Hlth & Primary Care, Leuven, Belgium
[4] Res Fdn Flanders FWO, Brussels, Belgium
[5] Univ Gothenburg, Inst Hlth & Care Sci, Gothenburg, Sweden
[6] Univ Cape Town, Dept Paediat & Child Hlth, Cape Town, South Africa