@article{efcf6b0d9b4d48b8964637d9721b59b8,
title = "Definition of the construct to be measured is a prerequisite for the assessment of validity. The Neck Disability Index as an example.",
author = "L. Ailliet and D.L. Knol and S.M. Rubinstein and \{de Vet\}, H.C.W. and \{van Tulder\}, M.W. and C.B. Terwee",
year = "2013",
doi = "10.1016/j.jclinepi.2013.02.005",
language = "English",
volume = "66",
pages = "775--782",
journal = "Journal of clinical epidemiology",
issn = "0895-4356",
publisher = "Elsevier USA",
number = "7",
}