Text and Data Mining valid from 2018-07-11
Received: 15 May 2018
Accepted: 3 July 2018
First Online: 11 July 2018
Compliance with Ethical Standards
: All the authors have no conflicts of interest and nothing to declare.
: This study was approved by an appropriate national ethics committee (UAHPEC/018753) and all respondents provided written informed consent. All procedures were in accordance with the ethical standards of the institutional ethics committee and with the 1964 Helsinki declaration.