Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: 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.

At our conference call today, we have with us the Chief Accountant Mr. Mikhail Rosseev and also Deputy Chairman of the Management Committee at PJSC Gazprom, as well as representatives of key departments at PJSC Gazprom, Gazprom Export and Gazprom Neft.

Answer: subsidiary: Gazprom, Gazprom Export; parent_organization: Gazprom Export, Gazprom