Psychosomatic therapy for patients frequently attending primary care with medically unexplained symptoms, the CORPUS trial: study protocol for a randomised controlled trial
Wortman, Margreet S.H. (Lectoraat Oefentherapie); van der Wouden, Johannes C.; Grutters, Janneke P.C.; Visser, Bart (Lectoraat Oefentherapie); Assendelft, Willem J.J.; van der Horst, Henriëtte E.; olde Hartman, Tim C.