Using psychometric and clinimetric techniques to select items for use in a new instrument to measure cancer-related fatigue - Baro, E; Carulla, J; Valentin, V; Rodriguez, C; Gascon, P; Garcia-Mata, J; Colomer, R; Cassinello, J; Herdman, M; Gasquet, J A; Sanchez, J (Value In Health, 2006)