Impact of growing cohorts of adults with congenital heart disease on clinical workload: a 20-year experience at a tertiary care centre oleh Maria Padrutt, Isabelle Bracher, Francesca Bonassin, Bruno Santos Lopes, Christiane Gruner, Simon F. Stämpfli, Thomas Wolber, Oliver Kretschmar, Angela Oxenius, Gabriella De Pasquale, Theresa Seeliger, Thomas F. Lüscher, Christine Attenhofer Jost, Matthias Greutmann