Text and Data Mining valid from 2018-05-01
Received: 19 September 2017
Accepted: 21 April 2018
First Online: 1 May 2018
Compliance with ethical standards
: Philip C. Müller, Daniel C. Steinemann, Lukas Chinczewski, Gencay Hatiboglu, Felix Nickel, Kaspar Z’graggen, and Beat P. Müller-Stich have no conflict of interest or financial ties to disclose.