Text and Data Mining valid from 2019-01-01
Received: 16 February 2018
Accepted: 13 January 2019
First Online: 30 January 2019
Compliance with ethical standards
: DK, AW, RC, and MC declared no conflicts of interest.
: As there was no data analysis or patient involvement in this review, this work was exempt from the institutional review board process.
: For this type of study, formal consent is not required.