STEP 1: Evaluate the quality of the PROM development, using COSMIN box 1 is just used for us to understand how to give score to the PROM development study?
In table1, two columns named "content validity study1" and "content validity study2" mean different studies for a tool? For example, questionare 1 has 2 articles, and we need to mark them and then calculate the Rating of reviewers in table 1?
box 2 talked about asking patients and professionals, I do not know how to do this part, actually, we just conduct meta-analysis.
