Cognitive behavioral therapy or graded exercise therapy compared with usual care for severe fatigue in patients with advanced cancer during treatment: a randomized controlled trial

Hanneke Poort, Marlies Peters, Winette T.A. van der Graaf, Pythia T. Nieuwkerk, Agnès J. van de Wouw, Maria W. G. Nijhuis–van der Sanden, Gijs Bleijenberg, C.A.H.H.V.M. Verhagen, Hans Knoop