TY  - RPRT
TI  - Improving the response rates to questionnaires.
AU  - Liam Smeeth
AU  - Astrid E Fletcher
PY  - 2002
DO  - 10.1136/bmj.324.7347.1168
UR  - https://pubmed.ncbi.nlm.nih.gov/12016167/
ID  - 12016167
ER  -