1 Department of Medical and Surgical Sciences, University of Catanzaro "Magna Graecia", 88100 Catanzaro, Italy.
2 Cell and Developmental Biology Unit, Department of Biology, University of Pisa, 56127 Pisa, Italy.
3 Orthopaedics and Traumatology Unit, "Maggiore della Carità" Hospital, Department of Health Sciences, University of Piemonte Orientale, 28100 Novara, Italy.