Text and Data Mining valid from 2019-01-14
Received: 7 December 2018
Accepted: 9 January 2019
First Online: 14 January 2019
Compliance with ethical standards
: Constantinos Hadjipanayis is a Consultant for NXDC and Synaptive Medical, Inc. He will receive royalties from NXDC. He has also received speaker fees by Carl Zeiss and Leica. Walter Stummer has received speaker and consultant fees by Carl Zeiss, Leica, Photonamic, Medac, and NXDC.
: This article does not contain any studies with human participants or animals performed by any of the authors.