Gene Center and Department of Biochemistry, Ludwig-Maximilians-Universität München, 80333 Munich, Germany.|Gene Center and Department of Biochemistry, Ludwig-Maximilians-Universität München, 80333 Munich, Germany.|Gene Center and Department of Biochemistry, Ludwig-Maximilians-Universität München, 80333 Munich, Germany.|Institut für Medizinische Biometrie, Informatik und Epidemiologie, University Hospital Bonn, 53105 Bonn, Germany.|Institute for Genetics, University of Cologne, 50647 Cologne, Germany.|Gene Center and Department of Biochemistry, Ludwig-Maximilians-Universität München, 80333 Munich, Germany.