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Additional file 1: Appendix 1. Screenshots of the dr. Bart app. Appendix 2. Baseline characteristics of participants in the study per indicator of use and non-users. Appendix 3. The 5 most and least often read paragraphs. Appendix 4. Median and interquartile range of the number of cumulative completed goals over time of the active users (n = 151). Appendix 5. Median and interquartile range of the number of cumulative logins over time of the active users (n = 151). Appendix 6. The 5 relatively most and least often completed goals (i.e., times completed / times chosen). Appendix 7. The 5 relatively most and least often chosen goals (i.e., times chosen / times proposed). Appendix 8. Some responses to the free-text option of the SUS. Appendix 9. Regression coefficient and 95% confidence interval of the relation between baseline characteristics and different parameters of use. Appendix 10. Spearman rank correlation coefficients between different indicators of use and beliefs regarding 5 treatment modalities in knee/hip OA as measured with the treatment beliefs in osteoarthritis questionnaire (TOA) (relative difference between baseline and six month follow-up).