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GETTING TO THE HEART OF STENTS December 09 ( PhysOrg.com ) -- Using the Canadian Light Source a team of researchers from Quebec Laval University and  Australia   La Trobe University  has discovered how to improve the nanometers-thick layer of polymer used to coat cardiac stents .
 country of headquarters: Australia, La Trobe University
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: Australia, La Trobe University