1. Department of Human Development and Family Studies, Iowa State University, Ames, Iowa, USA
2. Department of Kinesiology and Department of Psychology, Iowa State University, Ames, Iowa, USA
3. Department of Health and Human Development, Montana State University, Bozeman, Montana, USA
4. Department of Child and Family Science, California State University, Fresno, California, USA
5. Department of Education and Child Development, University of Chicago, Chicago, Illinois, USA