title: Using group-sequential analysis to achieve the optimal sample size.
authors.affiliation: Department of Obstetrics and Gynaecology, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, SAR, China.
authors.forename: Michael S
authors.initials: MS
authors.lastname: Rogers
authors.forename: Allan M Z
authors.initials: AM
authors.lastname: Chang
authors.forename: Susan
authors.initials: S
authors.lastname: Todd
mesh_terms: D003627:Data Interpretation, Statistical; D016032:Randomized Controlled Trials as Topic; D018401:Sample Size; D012494:Sampling Studies