TY  - RPRT
TI  - Sample size considerations for non-randomized comparative studies.
AU  - R W Makuch
AU  - R M Simon
PY  - 1980
DO  - 10.1016/0021-9681(80)90017-x
UR  - https://pubmed.ncbi.nlm.nih.gov/7354106/
ID  - 7354106
ER  -