1. Department of Applied Health Sciences, School of Public Health, Indiana University Bloomington, Bloomington, USA
2. National Tsing Hua University, Center for General Education, Hsinchu, Taiwan
3. Department of Global Health, Boston University School of Public Health, Boston, Massachusetts, USA
4. Department of Political Science, Department of Statistics, Iowa State University, Ames, Iowa, USA
5. Department of Biostatistics, Boston University School of Public Health, Boston, Massachusetts, USA