1. Institute for Medical Biometry and Statistics; Faculty of Medicine and Medical Center-University of Freiburg; Stefan-Meier-Str. 26 79104 Freiburg Germany
2. Freiburg Center for Data Analysis and Modeling (FDM); Eckerstr. 1 79104 Freiburg Germany
3. Institute of Statistics; Ulm University; Helmholtzstr. 18 89081 Ulm Germany