1. Department of Obstetrics and Gynecology, University of Alabama at Birmingham, Birmingham, Alabama, USA.
2. Department of Psychology and Behavior Analysis, Universidade Estadual de Londrina, Londrina, Paraná, Brazil.
3. Division of Preventive Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA.
4. Department of Quantitative Health Sciences, University of Massachusetts Medical School, Worcester, Massachusetts, USA.