aThe Third Republic of Korea Army, Ministry of National Defense, Seoul, Korea
bThe 2nd Air Defense Artillery Brigade, Air Force, Ministry of National Defense, Seoul, Korea
cThe 26th Mechanized Infantry Division, Ministry of National Defense, Seoul, Korea
dThe 11th Regiment, 1st Infantry Division, Ministry of National Defense, Seoul, Korea
eDivision of Epidemic Intelligence Service, Korea Centers for Disease Control and Prevention, Osong, Korea
fDivision of Vaccine Preventable Disease Control and National Immunization Program, Korea Centers for Disease Control and Prevention, Osong, Korea
© 2013 Published by Elsevier B.V. on behalf of Korea Centers for Disease Control and Prevention.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.