1. a I-BioStat , Universiteit Hasselt , Diepenbeek , Belgium
2. b Center for Statistics in Drug Development , Quintiles , Morrisville , North Carolina , USA
3. c I-BioStat , Katholieke Universiteit Leuven , Leuven , Belgium
4. d Eli Lilly & Co. , Lilly Corporate Center , Indianapolis , Indiana , USA