1. Cardiovascular Imaging Section, Department of Radiology, Brigham and Women’s Hospital, Boston, MA (M.J.H.).
2. William Harvey Research Institute, NIHR Barts Biomedical Research Centre, Queen Mary University London, Charterhouse Square, London, EC1M 6BQ, United Kingdom (S.E.P.).
3. Barts Heart Centre, St Bartholomew’s Hospital, Barts Health NHS Trust, West Smithfield, EC1A 7BE, London, United Kingdom (S.E.P.).