1. Department of Medicine and Public Health SciencesPenn State College of Medicine Hershey PA
2. Departments of Public Health Sciences and Obstetrics and GynecologyPenn State College of Medicine Hershey PA
3. Department of Public Health SciencesPenn State College of Medicine Hershey PA
4. Department of Obstetrics and GynecologyPenn State College of Medicine Hershey PA
5. Department of Health PsychologyUniversity of Manchester Manchester UK