1. World Health Organization (WHO). Special groups of travellers. In: International travel and health. Geneva: WHO; 2010. p. 171-4.
2. World Health Organization (WHO). Communicable disease alert and response for mass gatherings: key considerations, June 2008. Geneva: WHO; 2008. Available from: www.who.int/csr/Mass_gatherings2.pdf
3. Sex work and the 2010 FIFA World Cup: time for public health imperatives to prevail
4. Escherichia coliO104:H4 Outbreak in Germany
5. Barnes W, Smith R. Travel trends, 2010. Newport: Office for National Statistics. [Accessed 9 Sep 2012]. Available from: http://www.ons.gov.uk/ons/rel/ott/travel-trends/2010/travel-trends---2010.pdf