1. Division of Immunization, Korea Disease Control and Prevention Agency, Cheongju, Republic of Korea
2. KDI School of Public Policy and Management, Sejong, Republic of Korea
3. Graduate School of Public Health, Chungnam National University, Daejeon, Republic of Korea
4. College of Health and Medical Sciences, Youngsan University, Yangsan, Republic of Korea
5. Department of Nursing, Daedong College, Busan, Republic of Korea