1. Applied Health Sciences, Indiana University Bloomington School of Public Health, Bloomington, IN, USA;
2. Center for General Education, National Tsing Hua University, Hsinchu, Taiwan;
3. Psychiatry/Biostatistics/, University of Iowa, Iowa City, IA, USA;
4. Statistics/Political Science, Iowa State University, Ames, IA, USA;
5. Biostatistics, Boston University School of Public Health, Boston, MA, USA