The value of distinct depressive symptoms (PHQ‐9) to differentiate depression severity in cancer survivors: An item response approach. Issue 11 (30th August 2019) - van der Donk, Loek J.; Bickel, Esmée A.; Krijnen, Wim P.; Tovote, K. Annika; Sanderman, Robbert; Schroevers, Maya J.; Fleer, Joke