1. Division of Research, Kaiser Permanente Northern California, Oakland, California.
2. Family Violence Prevention Program, Kaiser Permanente Northern California, Oakland, California.
3. Obstetrics and Gynecology, Kaiser Antioch Medical Center, Antioch, California.
4. Department of Psychiatry, Kaiser Permanente San Jose, San Jose, California.
5. The Permanente Medical Group, Regional Offices, Kaiser Permanente Northern California, Oakland, California.