TY  - RPRT
TI  - Variations in general practitioners' response to postal questionnaires.
AU  - A Cartwright
AU  - A W Ward
PY  - 1968
DO  - 10.1136/jech.22.4.199
UR  - https://pubmed.ncbi.nlm.nih.gov/5727145/
ID  - 5727145
ER  -