1. From the School of Biomedical Engineering and Imaging Sciences, King’s College London, United Kingdom (R.H., T.S.B., C.P., R.M.B.)
2. National Heart and Lung Institute, Imperial College London, United Kingdom (R.H.)
3. Escuela de Ingeniería, Pontificia Universidad Catolica de Chile, Santiago, Chile (C.P., R.M.B.).