TY  - RPRT
TI  - Selecting, designing, and developing your questionnaire.
AU  - Petra M Boynton
AU  - Trisha Greenhalgh
PY  - 2004
DO  - 10.1136/bmj.328.7451.1312
UR  - https://pubmed.ncbi.nlm.nih.gov/15166072/
ID  - 15166072
ER  -