1. The Methodology Center, Department of Human Development and Family Studies, The Pennsylvania State University, USA
2. The Methodology Center, College of Health and Human Development, Penn State, University Park, PA 16802
3. Institute for Social Research, Department of Statistics, University of Michigan, USA
4. Department of Statistics, Department of Industrial and Operations Engineering, University of Michigan, USA
5. Department of Health Behavior and Health Education, University of Michigan, USA