1 Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy and Università Cattolica del S. Cuore, Rome, Italy.
2 Department of Surgical Sciences, Sapienza University of Rome, Rome, Italy.
3 Department of Radiological, Oncological and Pathological Sciences, Sapienza University of Rome, Rome, Italy.
4 Research Unit for Multi-factorial Diseases, Obesity and Diabetes, Istituti di Ricovero e Cura a Carattere Scientifico, Bambino Gesù Children's Hospital, Rome, Italy.
5 Department of Medicine III, Universitätsklinikum Carl Gustav Carus an der Technischen Universität Dresden, Dresden, Germany.
6 Paul Langerhans Institute Dresden of the Helmholtz Center Munich at University Hospital and Faculty of Medicine, TU Dresden, Dresden, Germany.
7 Diabetes and Nutritional Sciences, King's College London, London, United Kingdom.
8 Deutsches Zentrum für Diabetesforschung, DZD e.V., Neuherberg, Germany.
9 Department of Surgical Sciences, Sapienza University of Rome, Rome, Italy. giovanni.casella@uniroma1.it.