[1] Slovak Med Uniers, Natl Inst Cardiovasc Dis, ACHD Ctr, Dapertment Cardiol & Angiol,Med Fac, Bratislava, Slovakia
[2] Gottsegen Gy Hungarian Inst Cardiol Budapest, Dept Cardiol, Budapest, Hungary
[3] Jagiellonian Univ, Inst Cardiol, John Paul II Hosp, Dept Cardiac & Vasc Dis,Med Coll, Krakow, Poland
[4] Univ Med Ctr Ljubljana, Adult Congenital Heart Ctr, Ljubljana, Slovenia
[5] Motol Univ Hosp, Cardiovasc Ctr, Prague, Czech Republic
[6] Inst Cardiovasc Dis Dedinje, Dept Noninvas Cardiol, Belgrade, Serbia
[7] St Ekaterina Hosp, Dept Cardiol, Sofia, Bulgaria
[8] Natl Heart Hosp, Pediat Cardiol Clin, Sofia, Bulgaria
[9] Ukrainian Childrens Cardiac Ctr, Inst Cardiol, Kiev, Ukraine
[10] Paul Stradins Clin Univ Hosp, Riga, Latvia
[11] Royal Brompton Hosp, Adult Congenital Heart Ctr, London, England
[12] Natl Ctr Pulm Hypertens, London, England
[13] Univ Hosp Munster, Div Adult Congenital Heart Dis, Dept Cardiovasc Med, Munster, Germany