1. Department of Biomedical and Neuromotor Sciences, University of Bologna, 40126 Bologna, Italy
2. Unit of Bologna, CNR-Institute of Molecular Genetics “Luigi Cavalli Sforza”, 40136 Bologna, Italy
3. IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, Italy
4. Department of Medical Sciences, Unit of Medical Genetics, Università degli Studi di Ferrara, 44100 Ferrara, Italy
5. Department of Statistical Sciences, University of Bologna, 40126 Bologna, Italy
6. I Orthopedic and Traumatology Department, IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, Italy