Tolk, Jaap J, et al. “Measurement Properties of the OARSI Core Set of Performancebased Measures for Hip Osteoarthritis: A Prospective Cohort Study on Reliability, Construct Validity and Responsiveness in 90 Hip Osteoarthritis Patients”. Acta Orthopaedica, vol. 90, no. 1, Nov. 2018, pp. 15-20, doi:10.1080/17453674.2018.1539567.