Assertion: polycythemia's cause | /r/HasProperty | increased production of erythropoietin
Facets:
value: often
type: TEMPORAL
value: as a response to chronic hypoxia
type: CAUSE
Source sentences:
text: The cause of secondary polycythemia is often increased production of erythropoietin (EPO) as a response to chronic hypoxia or from an erythropoietin-secreting tumor.