Fig. 1: Overview of the COSMIN methodology including adaptions for our research situation.

Refer to the methods part and appendix of our publication for further information. For the unmodified, full version of the COSMIN methodology, refer to the COSMIN manual. Step 1: Risk of bias checklist. Step 2:Criteria for content validity and Updated criteria for good measurement properties.aFor the detailed criteria refer to the COSMIN manual for content validity. Step 3: Summarize the evidence and give a final rating. bThe same criteria like in Step 2 apply. cThese are the individual ratings on each result obtained in Step 2. Step 4: Grade approach. Step 5: Formulate recommendations. Step 6: Describe feasibility aspects.