Solutions for optimal care and research for children and adolescents with extremely rare cancers developed within the Joint Action for Rare Cancers (JARC) oleh Jelena Roganovic, Ewa Bien, Andrea Ferrari, Gilles Vassal, Annalisa Trama, Paolo G. Casali, Annita Kienesberger, Gianni Bisogno, Calogero Virgone, Tal Ben Ami, Yves Reguerre, Jan Godzinski, Nuno Jorge Farinha, Luca Bergamaschi, Dominik T. Schneider, Daniel Orbach, Ines B. Brecht