TY  - RPRT
TI  - Research methods for obtaining primary evidence.
AU  - R Jaeschke
AU  - D L Sackett
PY  - 1989
DO  - 10.1017/s0266462300008436
UR  - https://pubmed.ncbi.nlm.nih.gov/2699468/
ID  - 2699468
ER  -