1. Surgical Sciences Department, Medical School ‘Sapienza’ University, Rome, Italy
2. Department of Internal Medicine, Catholic University of Rome, Rome, Italy
3. Department of Diabetes and Nutritional Sciences, Faculty of Life Sciences and Medicine, King's College, London, UK
4. Medizinische Klinik und Poliklinik III, Universitätsklinikum Carl Gustav Carus an der Technischen Universität, Dresden, Germany