Conclusion
In conclusion, this study described the participative intervention development and feasibility testing of physiotherapy delivered matched treatment options as part of the Stratified Blended Physiotherapy approach for patients with neck and/or shoulder complaints. To serve a diverse group of patients, both app-based as well as paper-based materials were developed. However, the paper-based workbook was not used in the feasibility study. The results have informed amendments to the Stratified Blended Physiotherapy approach for patients with neck and/or shoulder complaints ready to use within a future cluster randomized trial.