01-12-2004
Use of item response theory to develop a shortened version of the EORTC QLQ-C30 emotional functioning scale
J.B. Bjorner, M.Aa. Petersen, M. Groenvold, N. Aaronson, M. Ahlner-elmqvist, J.I. Arraras, A. Brédart, P. Fayers, M. Jordhoy, M. Sprangers, M. Watson, T. Young