3287
In 1930 the first reported autopsy of an asbestosis sufferer was conducted in the  United States  and later presented by a doctor at the  Mayo Clinic  although in this case the exposure involved mining activities somewhere in South America .
 country of headquarters: United States, Mayo Clinic
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "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} 
Answer:
 country of headquarters: United States, Mayo Clinic