1. Tourism Industries Office, Trade Department, International Trade Administration, U.S. Department of Commerce, available at: http://www.tinet.ita.doc.gov; accessed June 18, 2004
2. Travelers’ and immigrants’ health;Steffen,1999
3. Health problems after travel to developing countries;Steffen;J Infect Dis,1987
4. A cumulative review of studies on travelers, their experience of illness and the implications of these findings;Cossar;J Infect,1990
5. Illness associated with travel;Cossar;Travel Med Int,1985