1. Women's Heart Center, The Christ Hospital Heart Vascular and Lung Institute, Cincinnati, Ohio, USA.
2. Barbra Streisand Women's Heart Center, Cedars-Sinai Smidt Heart Institute, Los Angeles, California, USA.
3. School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA.
4. Division of Cardiology, Department of Internal Medicine, University of California San Francisco, San Francisco, California, USA.
5. Department of Obstetrics and Gynecology, University of California San Francisco, San Francisco, California, USA.
6. Department of Anesthesiology, Northwestern University, Chicago, Illinois, USA.