TY  - RPRT
TI  - Sample size calculation for planning group sequential longitudinal trials.
AU  - A Liu
AU  - J M Boyett
AU  - X Xiong
PY  - 2000
DO  - 10.1002/(sici)1097-0258(20000130)19:2<205::aid-sim295>3.0.co;2-7
UR  - https://pubmed.ncbi.nlm.nih.gov/10641025/
ID  - 10641025
ER  -