1. World Health Organization. International travel and health. Available at: http://www.who.int/ith. Accessed September 14, 2012.
2. World Tourism Organization. Facts and figures. Available at: http://www.unwto.org/facts/menu. Accessed October 2, 2012.
3. Locally acquired dengue-Key West, Florida, 2009-2010;Centers for Disease Control and Prevention;MMWR Morb Mortal Wkly Rep,2010
4. Measles: Untied States, January-may 20, 2011;Centers for Disease Control and Prevention;MMWR Morb Mortal Wkly Rep,2011
5. Illness in long-term travelers visiting geo-sentinel clinics;Chen;Emerg Infect Dis,2009