1. Department of Health Behavior, School of Public Health; University of Alabama at Birmingham; RPHB 227, 1530 3rd Avenue South 45294-0022 Birmingham AL USA
2. Department of Human Development and Family Studies; The Pennsylvania State University; University Park PA USA
3. Institute for Social Science Research; The University of Alabama; Tuscaloosa AL USA
4. Department of Human Development and Family Studies; Auburn University; Auburn AL USA