TY  - RPRT
TI  - The UK General Practice Research Database.
AU  - T Walley
AU  - A Mantgani
PY  - 1997
DO  - 10.1016/s0140-6736(97)04248-7
UR  - https://pubmed.ncbi.nlm.nih.gov/10213569/
ID  - 10213569
ER  -