1. University of Medicine and Pharmacy Cluj-Napoca Hygiene, Pasteur 6, 400340 Cluj-Napoca, Romania
2. National Institute of Public Health, Av. Universidad #655, Col. Sta. Ma. Ahuacatitlán, 62100 Cuernavaca, Morelos, Mexico
3. University of South Carolina, 800 Sumter Street, Columbia, SC 29208, United States of America