1. University of Michigan Medical School, Ann Arbor, Michigan.
2. Department of Obstetrics and Gynecology, Program on Women's Health Care Effectiveness Research, Institute for Healthcare Policy and Innovation, University of Michigan, Ann Arbor, Michigan.
3. Undergraduate Research Opportunity Program, University of Michigan, Ann Arbor, Michigan.
4. Department of Behavioral Sciences and Health Education, Rollins School of Public Health, Emory University, Atlanta, Georgia.