We have endeavored to ensure that the information available on our web site is accessible to all. However, this is an ongoing process and it is possible that some users may encounter problems accessing some pages.

If you use special adaptive equipment to access the Web and need to request information in an alternative format pursuant to Section 508 of the Rehabilitation Act, please let us know. You may write to us at or call us at 301-496-7057.

Please provide the specific web address (URL) of the page on which you require assistance, along with a description of the problem, as this will help us address your needs in a timely manner.

For NIH employees who need assistance with accessibility issues, please contact the equal employment opportunity officer in your Institute.

To learn more about Section 508 regulations governing the accessibility of Federal electronic information products, visit the page.

PDF Files

Portable Document Format (PDF) files preserve all the fonts, formatting, graphics, and color of a printed document once it is placed on a web site. Several documents on the NIH-OTT web site are provided in PDF format. PDF files require the free Adobe© Acrobat Reader software for viewing. If you have a visual impairment, please visit for help in working more effectively with PDF files.

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