1 Centre for Research on Health and Social Care Management-Scuola di Direzione Aziendale, Department of Social and Political Sciences, Bocconi University, Milan 20136, Italy. Electronic address: francesco.longo@unibocconi.it.
2 Department of Pediatric Hematology and Oncology and Department of Cell and Gene Therapy, Istituto Di Ricovero e Cura a Carattere Scientifico Ospedale Pediatrico Bambino Gesù, Catholic University of the Sacred Heart, Rome, Italy.
3 Department of Experimental and Clinical Medicine, University of Firenze, Florence, Italy.
4 Department of Public Health and Pediatric Sciences, University of Turin, Turin, Italy.
5 Department of Oncology, University of Turin, Turin, Italy; Candiolo Institute, Fondazione del Piemonte per l'Oncologia, Istituto di Ricovero e Cura a Carattere Scientifico, Turin, Italy.
6 Department of Public Health, University of Pavia, Pavia, Italy.
7 Department of Medical and Surgical Sciences, Alma Mater Studiorum, University of Bologna, Bologna, Italy.
8 School of Public Health, Imperial College London, London, UK.