scholarly journals Two-Stage Group Sequential Designs for Comparative Clinical Trials

2008 ◽  
Vol 13 (1) ◽  
pp. 31-40 ◽  
Author(s):  
Sevil Bacanlı ◽  
Özgür Peker ◽  
Yaprak Demirhan
2008 ◽  
Vol 138 (2) ◽  
pp. 489-499 ◽  
Author(s):  
Yuliya Lokhnygina ◽  
Anastasios A. Tsiatis

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