1 Cardiovascular Research Institute, Baylor College of Medicine, Houston, Texas, USA; Department of Integrative Physiology, Baylor College of Medicine, Houston, Texas, USA.
2 Cardiovascular Research Institute, Baylor College of Medicine, Houston, Texas, USA; Department of Integrative Physiology, Baylor College of Medicine, Houston, Texas, USA; Department of Medicine (Division of Cardiology), Baylor College of Medicine, Houston, Texas, USA; Department of Neuroscience, Baylor College of Medicine, Houston, Texas, USA; Department of Pediatrics (Division of Cardiology), Baylor College of Medicine, Houston, Texas, USA; Center for Space Medicine, Baylor College of Medicine, Houston, Texas, USA. Electronic address: wehrens@bcm.edu.