TY  - RPRT
TI  - Pre-screening questionnaires, screening and post-screening programmes.
AU  - C H Walker
PY  - 1977
DO  - 10.1111/j.1469-8749.1977.tb07976.x
UR  - https://pubmed.ncbi.nlm.nih.gov/858451/
ID  - 858451
ER  -