McLean, J., Brumby-Rendell, O., Lisle, R., Brazier, J., Dunn, K., Gill, T., … Leith, J. (2018). Asymptomatic population reference values for three knee patient-reported outcomes measures: evaluation of an electronic data collection system and implications for future international, multi-centre cohort studies. Archives of Orthopaedic and Trauma Surgery. https://doi.org/10.1007/s00402-018-2874-4 (Original work published 2018)