1. 1. Center for Disease Control and Prevention. Overweight and obesity. [Online]. [WWW document]. URL http://www.cdc.gov/nccdphp/dnpa/obesity/index.htm/ (accessed 25 November 2008).
2. 2. Center for Disease Control and Prevention. Overweight and obesity. [Online]. [WWW document]. URL http://www.cdc.gov/nccdphp/dnpa/obesity/childhood/prevalence.htm/ (accessed 25 November 2008).
3. 3. World Health Organization. Overweight and obesity. [Online]. [WWW document]. URL http://www.who.int/dietphysicalactivity/publications/facts/obesity/en/ (accessed 25 November 2008).
4. 4. Center for Disease Control and Prevention. Overweight and obesity. [Online]. [WWW document]. URL http://www.cdc.gov/nccdphp/dnpa/obesity/economic_consequences.htm/ (accessed 25 November 2008).
5. Genetic and environmental contributions to obesity;Hill;Am J Clin Nutr,1998