Text and Data Mining valid from 2019-01-31
Received: 6 December 2018
Accepted: 21 January 2019
First Online: 31 January 2019
Change Date: 4 March 2019
Change Type: Correction
Change Details: Following publication of the original article , the author reported an error in the title; the word study should be changed to students as indicated below:
Ethics approval and consent to participate
: This study was approved by the Universidad de Navarra School of Medicine and by the Committee for Research Ethics of the Universidad de Navarra (approval certificate number 2017.175). Participation of the students in the study was voluntary, without the need of a written informed consent. This manuscript does not contain any individual person data.
: Not applicable.Study is available from the corresponding author on reasonable request.
: The authors declare that they have no competing interests.
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