Received: 18 November 2019
Revised: 30 March 2020
Accepted: 19 May 2020
First Online: 29 June 2020
Compliance with ethical standards
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee (Comitê de Ética em Pesquisa Envolvendo Seres Humanos da Universidade Estadual de Londrina- number 2.150.760) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of study, formal consent is not required.
: The authors declare that they have no conflict of interest.