Text and Data Mining valid from 2020-01-29
Received: 27 November 2019
Accepted: 20 January 2020
First Online: 29 January 2020
Ethics approval and consent to participate
: This research was carried out according to the Helsinki Declaration ethic guidelines, updated at the World Medical Assembly in Seoul in 2008, for research with human subjects. All the participants were informed about the purpose of the study and gave their voluntary signed informed consent.
: Not applicable.
: The authors declare that they have no competing interests.