Department of Statistical Genetics, Max Planck Institute of Psychiatry, Munich, Germany. altmann@mpipsykl.mpg.de|Department of Statistical Genetics, Max Planck Institute of Psychiatry, Munich, Germany. altmann@mpipsykl.mpg.de|Department of Statistical Genetics, Max Planck Institute of Psychiatry, Munich, Germany. altmann@mpipsykl.mpg.de|Department of Statistical Genetics, Max Planck Institute of Psychiatry, Munich, Germany. altmann@mpipsykl.mpg.de|Department of Statistical Genetics, Max Planck Institute of Psychiatry, Munich, Germany. altmann@mpipsykl.mpg.de|Department of Statistical Genetics, Max Planck Institute of Psychiatry, Munich, Germany. altmann@mpipsykl.mpg.de