Content validity
To establish consensus for content validity beyond the standard error of proportion (P < 0.05) the content validity index (CVI) required was ≥0.70. In the first evaluation of ten experts our CVI was 0.80 for the initial 32 items while 26 of them scored an acceptable CVI for inclusion. The remaining 6 items were discussed, missing concepts identified and a final CVI employed to determine inclusion. Afterwards it was applied to the pilot group(n=5). They reported all 32 items were clear, understandable and applicable. Later, we started the study process that we applied the questionnaire to 50 patients.