1. Department for Computational Biology and Applied Algorithmics, Max Planck Institute for Informatics, D-66123 Saarbrücken, Germany
2. Saarbrücken Graduate School of Computer Science, University of Saarland, D-66123 Saarbrücken, Germany
3. Computational Biomolecular Dynamics Group, Department of Theoretical and Computational Biophysics, Max Planck Institute for Biophysical Chemistry, D-37077 Göttingen, Germany
4. Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
5. Institute for Virology, University Clinic of Cologne, D-50935 Köln, Germany