Brodersen J, Meads DM, Kreiner S, Thorsen H, Doward LC, McKenna SP. Methodological aspects of differential item functioning in the Rasch model. J Med Econ. 2007;10:309-22.
Doward LC, McKenna SP, Whalley D, Tennant A, Griffiths B, Emery P. Measuring quality of life in lupus: development of the SLEQoL. Poster presented at the First EADV International Spring Symposium; February 2003. [abstract] J Eur Acad Dermatol Venereol. 2003 Mar; 17(Suppl 1):58.