Item response theory was used to shorten EORTC QLQ-C30 scales for use in palliative care
Autores:Alexander de Graeff, Jakob B. Bjorner, Neil Aaronson, Yvonne Brandberg, Mirjam Sprangers, Mogens Groenvold, Jane Blazeby, Morten Aa. Petersen, Peter Fayers, Eva Hammerlid, Galina Velikova