title: Testing a primary and a secondary endpoint in a group sequential design.
authors.affiliation: Department of Industrial Engineering and Management Sciences, Northwestern University, Evanston, Illnois 60208, USA. atamhane@northwestern.edu
authors.forename: Ajit C
authors.initials: AC
authors.lastname: Tamhane
authors.forename: Cyrus R
authors.initials: CR
authors.lastname: Mehta
authors.forename: Lingyun
authors.initials: L
authors.lastname: Liu