TY  - RPRT
TI  - Statistical methods in epidemiology. II: A commonsense approach to sample size estimation.
AU  - A S Rigby
AU  - A Vail
PY  - 1998
DO  - 10.3109/09638289809166102
UR  - https://pubmed.ncbi.nlm.nih.gov/9846240/
ID  - 9846240
ER  -