76 Chapter 3 After completion of the last assessment, 18 months after baseline, patients receive a gift card of €25,-. All collected data from interviews and questionnaires will be entered and stored online and in the onsite database. To promote data quality researchers will be trained in the study protocol and adequate administration of assessments. Weekly supervision sessions and team training meetings will be used to evaluate assessments. All data will be checked on missing data or specific errors or contradictions in data. Most of the time assessments will be filled in by patients on paper, therefore double data entry procedures will be performed to prevent defaults in data entry. Data entry and encoding by research associates will be consequently checked by a second associate. Besides, independent random data checks will be conducted on entry and encoding defaults. Participants may withdraw from the study or experimental intervention for any reason at any time. Discontinuation of treatment as usual or early discontinuation of the experimental intervention is not a reason for withdrawal from the study. In case of early discontinuation of the intervention patients will be motivated for participation during the following research assessments.
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