[Bethesda, Md.] : National Cancer Institute, [2009].
Format:
Book
1 online resource (6 pages) : PDF.
Note:
"This fact sheet was reviewed on 4/2/09"--Page 6.
Title from caption.
Downloaded from http://www.cancer.gov/cancertopics/factsheet/detection/Fs5_36.pd f on May 03, 2011.