1Post Graduate Program in Epidemiology, Federal University of Pelotas, Brazil
2Post Graduate Program in Public Health, Federal University of Rio Grande, Brazil
3Department of Clinical Epidemiology, Public Health Institute, Preventive Medicine and Public Health, University of Porto Medical School, Portugal
*Corresponding Author:
Bruna Celestino Schneider, Post Graduate Program in Epidemiology, Federal University of Pelotas, Brazil, Tel: +55 (53) 3284 – 1300, Fax: +55 (53) 3284 – 1300