1. Department of Pharmacology, Institute of Neuroscience and Physiology at the Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden (E. Studer, A. Westman, E. Eriksson); Institute of Mathematical Sciences, Chalmers University of Technology, Gothenburg, Sweden (S. Nilsson); Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden (N. L. Pedersen)