[1] Erasmus MC, Dept Cardiol, Rotterdam, Netherlands
[2] Univ Hosp Leuven, Dept Congenital & Struct Cardiol, Leuven, Belgium
[3] St Bartholomews Hosp, Dept Cardiol, Ctr Grown Up Congenital Heart Dis, London, England
[4] Ghent Univ Hosp, Ctr Med Genet, Dept Cardiol, Ghent, Belgium
[5] Royal Brompton Hosp, Dept Cardiol, London, England
[6] St Georges Univ London, Mol & Clin Sci Res Inst, London, England
[7] Malawi Coll Med, Dept Publ Hlth, Blantyre, Malawi
[8] Malawi Coll Med, Dept Obstet & Gynaecol, Blantyre, Malawi
[9] Univ Hosp WA1 4rzburg, Dept Anaesthesia & Crit Care, Wurzburg, Germany
[10] European Soc Anaesthesiol, Sci Subcomm Obstet Anaesthesiol, Brussels, Belgium
[11] Univ Cape Town, Hatter Inst Cardiovasc Res, Dept Med, Fac Hlth Sci,SA MRC Cape Heart Ctr, Cape Town, South Africa
[12] Univ Witwatersrand, Soweto Cardiovasc Res Unit, Johannesburg, South Africa
[13] Imperial Coll, Chelsea & Westminster Hosp, Dept Obstet, Sch Med, London, England