Kathryn M Yount1, Amber Peterman2, Yuk F Cheong3. 1. Rollins School of Public Health, Emory University, Atlanta, GA 30345, USA. Electronic address: kyount@emory.edu. 2. UNICEF Office of Research (Innocenti), 50122 Florence, Italy. 3. Department of Psychology, Emory University, Atlanta, GA 30345, USA.