1. Center for General Education, National Tsing Hua University, Hsinchu City, Taiwan (Republic of China)
2. Department of Applied Health Sciences, Indiana University School of Public Health, Bloomington, Indiana, USA
3. Department of Biostatistics, Boston University School of Public Health, Boston, Massachusetts, USA
4. Department of Political Science, Department of Statistics, Iowa State University College of Liberal Arts and Sciences, Ames, Iowa, USA