[1] Univ Lisbon, Fac Med, Rheumatol Res Unit, Inst Mol Med, P-1699 Lisbon, Portugal
[2] Hosp Santa Maria, EPE, Ctr Hosp Lisboa Norte, Dept Rheumatol, Lisbon, Portugal
[3] ICEMS, Inst Super Tecn, Dept Mech Engn, Lisbon, Portugal
[4] Harvard Univ, Beth Israel Deaconess Med Ctr, Dept Orthopaed Surg, Ctr Adv Orthopaed Studies, Boston, MA 02215 USA
[5] Hosp Santa Maria, Dept Orthopaed, Lisbon, Portugal
[6] Helsinki Univ Cent Hosp, Helsinki, Finland
[7] Lisbon Acad Med Ctr, Lisbon, Portugal