1. Department of Family Nursing Care, School of Nursing, The University of Texas Health Science Center at San Antonio, 7703 Floyd C Drive, San Antonio, TX 78230-3900, USA
2. Department of Obstetrics & Gynecology, The University of Texas Health Science Center at San Antonio, 7703 Floyd C Drive, San Antonio, TX 78230-3900, USA
3. Department of Biostatistics, Bioinformatics and Epidemiology, Medical University of South Carolina, Charleston, SC, USA
4. Department of Microbiology, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
5. San Antonio Metropolitan Health District, San Antonio, TX, USA