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China and the  United States  have had negotiations on food and drug security recently including the latest visit by Rich MeKeown chief of staff for the U.S. Department of  Health  and Human Services from Aug. 1 to 3 .
 country of headquarters: United States, Health
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
 Entity Pairs:  United States, Health 
Answer:
 country of headquarters: United States, Health