Division of Pediatrics, Department of Health Sciences, University of "Piemonte Orientale Amedeo Avogadro", Novara, Italy ; Endocrinology, Department of Clinical and Experimental Medicine, University of Piemonte Orientale, Novara, Italy ; I.C.O.S. (Interdisciplinary Center for Obesity Study), Novara, Italy. Division of Pediatrics, Department of Health Sciences, University of "Piemonte Orientale Amedeo Avogadro", Novara, Italy. Laboratory of Human Genetics, Department of Health Sciences, University of Piemonte Orientale, Novara, Italy. I.C.O.S. (Interdisciplinary Center for Obesity Study), Novara, Italy ; Laboratory of Human Genetics, Department of Health Sciences, University of Piemonte Orientale, Novara, Italy. Endocrinology, Department of Clinical and Experimental Medicine, University of Piemonte Orientale, Novara, Italy. Division of Pediatrics, Department of Health Sciences, University of "Piemonte Orientale Amedeo Avogadro", Novara, Italy ; I.C.O.S. (Interdisciplinary Center for Obesity Study), Novara, Italy.