Divisions of the Skeleton. U.S. National Cancer Institute's Surveillance, Epidemiology and End Results (SEER) Program. [24 August 2017]. (原始内容存档于14 January 2009).
Divisions of the Skeleton. U.S. National Cancer Institute's Surveillance, Epidemiology and End Results (SEER) Program. [24 August 2017]. (原始内容存档于14 January 2009).