@article{Wu2017, author = "Jianrong Wu and Xiaoping Xiong", title = "{Group Sequential Survival Trial Design and Monitoring Using the Log-Rank Test}", year = "2017", month = "5", url = "https://tandf.figshare.com/articles/journal_contribution/Group_Sequential_Survival_Trial_Design_and_Monitoring_Using_the_Log-Rank_Test/4715938", doi = "10.6084/m9.figshare.4715938.v1" }