TY  - RPRT
TI  - BMJ Learning.
AU  - Edward Briffa
AU  - Kamran Abbasi
PY  - 2003
DO  - 10.1136/bmj.326.7382.176
UR  - https://pubmed.ncbi.nlm.nih.gov/12543818/
ID  - 12543818
ER  -