Text and Data Mining valid from 2018-12-01
Received: 8 October 2018
Accepted: 10 December 2018
First Online: 29 December 2018
Ethics approval and consent to participate
: The medical ethic committee of the University and National Commission for Research Ethics approved the study (06/10/2015). This study has been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki. Informed consent was obtained from all participants included in the study.
: The manuscript does not contain any individual person’s data in any form.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.