Assertion: sacrum | /r/HasProperty | sif
Facets:
Source sentences:
text: Insufficiency fractures of the sacrum (SIFs) were first described by Lourie in 1982.3 Patients undergoing radiotherapy to treat malignant tumors may be at particular risk of SIFs,4 with a prevalence of 89% for patients undergoing radiotherapy for cervical cancer.5