1. From the Department of Cardiology, Medical University of Vienna, Austria (M.G., P.M.H.)
2. Ludwig Boltzmann Cluster for Cardiovascular Research, Vienna, Austria (P.M.H.)
3. 3rd Department of Medicine, Cardiology and Intensive Care Medicine, Chest Pain Unit, Wilhelminenhospital, Vienna, Austria (P.M.H.)
4. Division of Psychological Medicine and Clinical Neurosciences, MRC Centre for Neuropsychiatric Genetics and Genomics, Cardiff University, United Kingdom (D.J.B.)
5. Nuffield Division of Clinical Laboratory Sciences, Radcliffe Department of Medicine, University of Oxford, United Kingdom (E.M.R.).