Early impact of the COVID-19 pandemic on congenital heart surgery programs across the world: assessment by a global multi-societal consortium - Protopapas, Eleftherios M; Rito, Mauro Lo; Vida, Vladimiro L; Sarris, George E; Tchervenkov,Christo I; Maruszewski, Bohdan J; Tobota, Zdzislaw; Zheleva, Bistra; Zhang, Hao; Jatene, Marcelo Biscegli (World journal for pediatric and congenital heart surgery, 2020)