1. Department of Epidemiology, School of Medicine in Katowice, University of Silesia, Katowice, Poland.
a. http://orcid.org/0000-0002-0106-9662
b. http://orcid.org/0000-0002-1619-3463
Recebido: 25 abril 2017.
Aprovado: 15 outubro 2017.
Trabalho realizado no Department of Epidemiology, School of Medicine in Katowice, University of Silesia, Katowice, Poland.
Endereço para correspondência:
Kamil Barański. School of Medicine in Katowice, University of Silesia, Medyków 18, 40-752, Katowice, Poland.
Fax: 48 32 2088538. E-mail: kbaranski@sum.edu.pl
Apoio financeiro: Este estudo recebeu apoio financeiro de Medical University of Silesia (Processo no. KNW-2-020/N/5/K e KNW-1-069/K/6/0).