1. Hannover Medical School, Carl-Neuberg-Strasse 1, D-30625, Hannover, Germany.
2. Department of Biomechanics, Medicine and Rehabilitation of Locomotor System, Ribeirão Preto Medical School, São Paulo University, Avenue, Bandeirantes 3900-11O. andar, 14049-900, Ribeirão Preto, São Paulo, Brazil.
3. Orthopaedic Department, Hospital for Special Surgery, 535 East 70th Street, New York, 10021, New York, USA.