1. Center for Women’s Reproductive Health, University of Alabama at Birmingham, Birmingham, AL, USA
2. Department of Obstetrics and Gynecology, University of Alabama at Birmingham, Birmingham, AL, USA
3. Medical Scientist Training Program, University of Alabama at Birmingham, Birmingham, AL, USA
4. Department of Biostatistics, University of Alabama at Birmingham, Birmingham, AL, USA
5. Department of Women’s Health, University of Texas at Austin, Dell Medical School, Austin, TX, USA