1. Department of Obstetrics and Gynecology, Women’s Reproductive Health Research Center, Vanderbilt University Medical Center, Nashville, TN, USA
2. Division of Infectious Disease, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
3. Department of Pathology, Microbiology and Immunology, Vanderbilt University School of Medicine, Nashville, TN, USA
4. VA Tennessee Valley Healthcare System, Nashville, TN, USA