Clinical phenotypes and prognostic factors in persons with hip osteoarthritis undergoing total hip arthroplasty: protocol for a longitudinal prospective cohort study (HIPPROCLIPS) oleh Abner Sergooris, Jonas Verbrugghe, Thomas Matheve, Maaike Van Den Houte, Bruno Bonnechère, Kristoff Corten, Katleen Bogaerts, Annick Timmermans