Text and Data Mining valid from 2018-07-27
Received: 22 November 2017
Accepted: 28 June 2018
First Online: 27 July 2018
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of the University of Navarra (ClinicalTrials.gov Identifier: NCT02669602). Informed consent was implied by the voluntary completion of the first questionnaire.
: The authors declare that they have no competing interests.
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