1. Biophysics; Center for Integrative Physiology and Molecular Medicine, School of Medicine, Saarland University; Homburg 66421 Germany
2. Cardiovascular Physiology, University Medical Center; University of Göttingen; Göttingen 37073 Germany
3. Department of Theoretical Physics; Saarland University; Saarbrücken 66041 Germany
4. Physiology; Center for Integrative Physiology and Molecular Medicine, School of Medicine, Saarland University; Homburg 66421 Germany
5. Department of Biochemistry and Theoretical Physics; University of Geneva; Geneva 1211 Switzerland
6. Molecular Biophysics, Center for Integrative Physiology and Molecular Medicine, School of Medicine; Saarland University; Homburg 66421 Germany