1. Department of Public Health, Experimental and Forensic Medicine, School of Medicine, Endocrinology and Nutrition Unit, University of Pavia, Azienda di Servizi alla Persona di Pavia, Pavia, Italy
2. Department of Gastroenterology, Policlinico di Monza, 20900 Milan, Italy
3. Research and Development Department, Indena SpA, 20139 Milan, Italy
4. Department of Public Health Experimental and Forensic Medicine, Unit of Biostatistics and Clinical Epidemiology, University of Pavia, Pavia, Italy
5. Department of Brain and Behavioral Sciences, Section of Biostatistics, Neurophysiology and Psychiatry, University of Pavia, Pavia, Italy