Caroline B. Terwee, Sandra D.M. Bot, Michiel R. de Boer, Daniƫlle van der Windt, Dirk L. Knol, Joost Dekker, L.M. Bouter, Henrica C. W. de Vet (2006). Quality criteria were proposed for measurement properties of health status questionnaires. Journal of Clinical Epidemiology. https://doi.org/10.1016/j.jclinepi.2006.03.012