1. Movement Analysis Laboratory and Functional-Clinical Evaluation of Prostheses; Istituto Ortopedico Rizzoli; Via di Barbiano 1/10 Bologna 40136 Italy
2. Department of Orthopaedics and Traumatology; Modena Policlinic; Modena Italy
3. Istituto Ortopedico Galeazzi; Milano; Italy
4. Department of BEAMS; Université Libre de Bruxelles; Bruxelles Belgium