1. Department of Experimental and Clinical Biomedical Sciences, University of Florence, 50139 Florence, Italy
2. Italian Foundation for the Research on Bone Diseases (F.I.R.M.O.), 50129 Florence, Italy
3. Plastic and Reconstructive Microsurgery, Careggi University Hospital, 50134 Florence, Italy
4. IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, Italy
5. Orthopedic Unit, Department of Health Sciences, University of Florence, C.T.O., 50139 Florence, Italy