TY  - RPRT
TI  - Cost efficiency in study planning and completion. How many cases? How many controls?
AU  - M J Rosenberg
PY  - 1983
DO  - 10.1016/0002-9343(83)90414-x
UR  - https://pubmed.ncbi.nlm.nih.gov/6416065/
ID  - 6416065
ER  -