Text and Data Mining valid from 2019-07-12
Received: 2 April 2019
Accepted: 21 June 2019
First Online: 12 July 2019
Compliance with ethical standards
: One author has received travel expenses by Implantcast Gmbh, Buxtehude, Germany outside the submitted work.
: Approval of the institutional review board was obtained prior to this investigation (local ethical committee ref. no. 2018-123-f-S).