Mathematical Sciences Department, Worcester Polytechnic Institute, Massachusetts, United States of America.|Mallinckrodt Institute of Radiology, Washington University, St. Louis, Missouri, United States of America.|The Cardiovascular Research Foundation, New York, New York, United States of America.|Mathematical Sciences Department, Worcester Polytechnic Institute, Massachusetts, United States of America.|Biomedical Engineering Department, Worcester Polytechnic Institute, Worcester, Massachusetts, United States of America.|Mathematical Sciences Department, Worcester Polytechnic Institute, Massachusetts, United States of America.|Cardiovascular Division, Washington University School of Medicine, St. Louis, Missouri, United States of America.|Mallinckrodt Institute of Radiology, Washington University, St. Louis, Missouri, United States of America.|The Cardiovascular Research Foundation, New York, New York, United States of America.|Mathematical Sciences Department, Worcester Polytechnic Institute, Massachusetts, United States of America.