1. Harris School of Public Policy Studies; University of Chicago; 1155 East 60th Street Chicago Illinois 60637 U.S.A.
2. Department of Computer Science and Communication Engineering; Providence University; 200 Chung Chi Road Taichung 43301 Taiwan
3. National Institute of Infectious Diseases and Vaccinology; National Health Research Institutes; 35 Keyan Road, Zhunan, Miaoli County 350 Taiwan