Assertion: water polo | /r/HasProperty | growing sport
Facets:
value: rapidly
type: MANNER
value: in the united states
type: LOCATION
Source sentences:
text: Even though water polo is a growing sport, Steffens said, “
text: Water polo is a rigorous, full-contact, and rapidly growing sport in the United States  that is associated with a risk of head and face injury [16–18] in which head impacts have not been studied in vivo.