title: Reply.
authors.affiliation: University of Oxford and the Arthritis Research UK Centre for Sport, Exercise, and Osteoarthritis Oxford, UK.
authors.forename: Kirsten M
authors.initials: KM
authors.lastname: Leyland
authors.affiliation: University of Oxford and the Arthritis Research UK Centre for Sport, Exercise, and Osteoarthritis Oxford, UK.
authors.forename: Nigel K
authors.initials: NK
authors.lastname: Arden
authors.affiliation: University of Oxford, Oxford, UK.|FIMIM-Parc Salut Mar and RETICEF GREMPAL Research Group IDIAP Jordi Gol Primary Care Research Institute Universitat Autòonoma de Barcelona Barcelona, Spain.
authors.forename: D
authors.initials: D
authors.lastname: Prieto-Alhambra