1. Institute of Vegetative Physiology; Charité-Universitätsmedizin Berlin; Berlin Germany
2. Department of Internal Medicine II; University Medical Center Regensburg; Regensburg Germany
3. Institute of Medical Cell Biology; Uppsala University; Uppsala Sweden
4. Institute of Biochemistry; Hannover Medical School; Hannover Germany
5. Heart Institute; University of São Paulo; School of Medicine; São Paulo Brazil
6. Cardiovascular Physiology; Centre for Biomedicine and Medical Technology Mannheim; Ruprecht-Karls-University Heidelberg; Mannheim Germany