1. Department of Psychology and Education, Psychology and Education, Mount Holyoke College, South Hadley, Massachusetts, USA
2. Department of Psychology, University of North Dakota, Grand Forks, North Dakota, USA
3. Department of Sociology and Social Anthropology, Dalhousie University, Halifax, Nova Scotia, Canada
4. Department of Biostatistics and Epidemiology, University of Massachusetts Amherst, Amherst, Massachusetts, USA