Funding for this research was provided by:
Received: 10 December 2018
Revised: 17 April 2019
Accepted: 22 April 2019
First Online: 10 May 2019
Compliance with ethical standards
: All procedures in studies involving human participants were performed in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Approval was granted by the Local Bioethics Committee for Research (Comité de Ética en Investigación, CONBIOETICA-09-CEI-007-20180529).
: Informed consent was obtained from all participants included in the study.