Text and Data Mining valid from 2018-11-14
Received: 1 February 2018
Accepted: 8 November 2018
First Online: 14 November 2018
Compliance with ethical standards
: The authors have no conflicts of interest.
: This work is a review of the literature and did not require ethical approval to be carried out.
: Informed consent was obtained from all individual participants included in the study.