1 Department of Internal Medicine, Hospital Mutua Terrassa, University of Barcelona, Barcelona, Spain.
2 Medical Research Council Population Health Research Unit, Clinical Trial Service Unit and Epidemiological Studies Unit, Nuffield Department of Population Health, University of Oxford, Oxford, UK.
3 Hypertension Unit and Cardiorenal Translational Research Laboratory, Institute of Research i+12, Hospital Universitario 12 de Octubre and CIBER of Cardiovascular Disease (CIBERCV), Madrid, Spain; School of Doctoral Studies and Research, Universidad Europea de Madrid, Madrid, Spain.
4 Institute of Cardiovascular Science and National Institute for Health Research, University College London (UCL), UCL Hospitals Biomedical Research Centre, London W1T 7DN, UK. Electronic address: bryan.williams@ucl.ac.uk.