Received: 24 April 2019
Accepted: 26 August 2019
First Online: 11 September 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee for Research of Granada, in Spain. At the beginning of the survey, an institutional letter was delivered to each selected subjects, presenting the study and other relevant information of the project, and written informed consent was obtained.
: ‘Not Applicable’.
: The authors declare that they have no competing interests.