Identifying obstacles hindering the conduct of academic-sponsored trials for drug repurposing on rare-diseases: an analysis of six use cases. - del Álamo, Marta; Bührer, Christoph; Fisher, Dirk; Griese, Matthias; Lingor, Paul; Palladini, Giovanni; Sireau, Nicolas; Hivert, Virginie; Sangiorgi, Luca; Guillot, Florence; Halftermeyer, Juliane; Soucková, Lenka; et al. (Trials, 2022)