Text and Data Mining valid from 2019-11-04
Received: 8 April 2019
Accepted: 18 October 2019
First Online: 4 November 2019
Ethics approval and consent to participate
: This study involved only analysis of data from published scientific literature; we did not collect any participant data.
: Not applicable.
: Livia Puljak is the section editor of the BMC Medical Research Methodology, but she was not involved in handling of this manuscript in any way. The remaining authors declare that they have no competing interests.