TY  - RPRT
TI  - A comparison of group sequential methods for binary longitudinal data.
AU  - Bart Spiessens
AU  - Emmanuel Lesaffre
AU  - Geert Verbeke
PY  - 2003
DO  - 10.1002/sim.1361
UR  - https://pubmed.ncbi.nlm.nih.gov/12590410/
ID  - 12590410
ER  -