1 Department of Medical and Surgical Sciences for Children and Adults, University of Modena and Reggio Emilia, Modena, Italy.
2 Department of Life Quality Studies, "Alma Mater Studiorum", University of Bologna, Bologna, Italy.
3 Department of Medical and Surgical Sciences for Children and Adults, University of Modena and Reggio Emilia, Modena, Italy. Electronic address: [email protected].