What is the relationship between Citizen Lab and University of Toronto 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.

As early as 2014, a report by the Citizen Lab at the University of Toronto indicated that Hacking Team’s products were used in Ethiopia, Sudan, Oman, Egypt and elsewhere.

Answer: headquarters_location