TY  - RPRT
TI  - Qualitative research.
AU  - R Fitzpatrick
AU  - M Boulton
PY  - 1996
DO  - 10.1016/s0140-6736(05)64639-9
UR  - https://pubmed.ncbi.nlm.nih.gov/8676691/
ID  - 8676691
ER  -