1. Department of Dairy Science and Quality Development, Faculty of Food Sciences, University of Warmia and Mazury in Olsztyn, Oczapowski 7 Str., 10-719 Olsztyn, Poland
2. Division of Quality and Environmental Management, Department of Business Economics, Faculty of Management, University of Gdańsk, Armii Krajowej 101 St., 81-824 Sopot, Poland