What is the relationship between Kathimerini and ATHENS 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.

ATHENS (Reuters) - Greece is preparing a reform package worth 12 billion euros ($13.33 billion) over two years, more than previously planned, in an effort to offset a return to recession after months of negotiations with creditors, the Greek newspaper Kathimerini reported.

Answer: headquarters_location