Text and Data Mining valid from 2019-11-04
Received: 2 July 2019
Accepted: 22 October 2019
First Online: 4 November 2019
Compliance with ethical standards
: Hereby, we state that we have submitted our work as an original article and have made substantial contributions to the following: The conception and design of the study, data acquisition, analysis and interpretation of data, drafting the article or revising it critically for important intellectual content. We have read and concur with the content in the manuscript, and the final version is submitted with the approval of all authors. We do not have any financial or personal relationships with other people or organizations that could inappropriately influence or bias our work. The material within this manuscript has not been and will not be submitted for publication elsewhere except as an abstract.
: In all cases presented, human studies have been approved by the appropriate ethics committee according to requirements and have therefore been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki. All persons involved in monitoring gave their informed consent prior to their inclusion in the study.