At the start of this study, guideline adherence was too low to be able to make any meaningful comparison between the treatment results of patients that received guideline adherent care and those who did not. Successful implementation was thus a necessary step in performing this cohort study. The treatment coordinator of the anxiety disorder unit was closely involved with this study and a key figure during the process of implementation. During the course of the study, a PhD student supervised by the treatment coordinator had an average of 16 hours per week available for facilitating the process of guideline implementation and the collection of data. Dutch multidisciplinary guidelines for anxiety disorders. The multidisciplinary guidelines for anxiety disorders were first published by the workgroup for anxiety disorders in 2003.