Many of you have contacted us for answers to questions and to obtain more information about particular diseases. Please remember, we are not a referral service and that the information provided is not a substitute for the advice of a healthcare practitioner who is familiar with your medical history. In this section, we provide links to organizations that might be able to answer your questions. The inclusion of a site does not imply endorsement of the organization or of the quality of their website’s content. Click on the appropriate topic below to see a list of websites that may be helpful.