1 Swiss Cardiovascular Center, University of Bern, Inselspital, Freiburgstrasse, Bern 3010, Switzerland.
2 Departement for BioMedical Research, University of Bern, 3008 Bern, Switzerland.
3 University Medical Centre Ljubljana, Department of Hypertension, University of Ljubljana, Faculty of Medicine, Vodnikova 62, 1000 Ljubljana, Slovenia.
4 Imperial College London, National Heart & Lung Institute, ICTEM Building, Du Cane Road, London W12 0NN, UK.
5 London School of Hygiene and Tropical Medicine.
6 Department of Clinical and Experimental Medicine, University of Pisa, Via Roma 67, Pisa 56126, Italy.