1. Barbra Streisand Women's Heart Center, Smidt Heart Institute, Cedars-Sinai Medical Center, Los Angeles, California.
2. Department of Nursing Research, Brawerman Nursing Institute, Cedars-Sinai Medical Center, Los Angeles, California.
3. School of Nursing, University of California, Los Angeles, Los Angeles, California.
4. Department of Obstetrics and Gynecology, Cedars-Sinai Medical Center, Los Angeles, California.
5. Central Coast Perinatology, Santa Barbara, California.
6. Biostatistics and Bioinformatics Research Center, Cedars-Sinai Medical Center, Los Angeles, California.