Online learning in palliative care education of undergraduate medical students: a realist synthesis oleh Gianfranco Martucci, Jose Pereira, Csilla Busa, Carlos Centeno, Agnes Csikos, Luca Franchini, Frank Elsner, Melania Raccichini, Maria-Mirabela Mihailescu-Marin, Daniela Mosoiu, Sandra Rubio Bernabé, Alexandra Scherg, Fabrizio Consorti