2680
ATS Medical  Inc. ( NASDAQ : ATSI ) ( ATS stands for Advancing the standards ) based in  Minneapolis  Minnesotahttp : / / www.atsmedical.com/Company.aspx?id=958 is a developer and manufacturer of products and services for the cardiac surgery market .
 city of headquarters: ATS Medical, Minneapolis
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:  ATS Medical, Minneapolis 
Answer:
 city of headquarters: ATS Medical, Minneapolis