Randomization and treatment allocation. After meeting the inclusion criteria, patients are randomized to the 3 conditions (resource priming, supportive resource priming, adherence priming). Treatment allocation is performed randomly by online application of a full randomization. In this way, we aim to ensure that trial arms are balanced with respect to the patients' baseline characteristics. Randomization procedure is conducted by two independent research assistants. Because all patients are treated by the same CBT-manual, patients are blinded for the treatment allocation and are not informed about the randomization procedure.