Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Graphical representations of ontology hierarchies generated by the author WL from the cancer registry coded terms. In (a) a single term for a surgical mastectomy is interpreted by WL into a part of the ontology hierarchy. (b) shows the complete ontology hierarchy for chemotherapy codes that was used in the study.
