Received: 24 August 2017
Accepted: 7 January 2018
First Online: 23 January 2018
Ethics approval and consent to participate
: This study was approved by the Local Research Ethics Committee Costa del Sol (Spain) CEI (003_mayo_PR2-Malas Noticias) on 01 June 2015, and was carried out in accordance with the ethical principles as set out in the Declaration of Helsinki. Written consent was obtained from all the participants in the study.
: Not applicable in this section.
: The authors declare that they have no competing interests.
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