What is the relationship between Highmark and Pittsburgh in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.
Text: On the commercial side, in Q2, we improve net coverage within two prominent regional commercial plans, Highmark Blue Cross Blue Shield and the University of Pittsburgh Medical Center or UPFC.
user
headquarters_location
assistant