TY  - RPRT
TI  - An introduction to power and sample size estimation.
AU  - S R Jones
AU  - S Carley
AU  - M Harrison
PY  - 2003
DO  - 10.1136/emj.20.5.453
UR  - https://pubmed.ncbi.nlm.nih.gov/12954688/
ID  - 12954688
ER  -