TY  - RPRT
TI  - Comparison between communities.
AU  - A R Walker
AU  - A Duvenhage
AU  - I Segal
PY  - 1979
DO  - 10.1136/bmj.1.6157.196-c
UR  - https://pubmed.ncbi.nlm.nih.gov/421017/
ID  - 421017
ER  -