1. National Library of Medicine. MEDLINE plus health information. Available at: http://www.nlm.nih.gov/medlineplus./ Accessed June 23 2003.
2. WebMDHealth web site. Available at: http://my.webmd.com. Accessed June 23 2003.
3. National Library of Medicine. Health information. Available at: http://www.nlm.nih.gov/hinfo.html. Accessed June 23 2003.
4. National Institute of Diabetes and Digestive and Kidney Disease web site. Available at: http://www.niddk.nih.gov. Accessed June 23 2003.