Text and Data Mining valid from 2018-01-29
Received: 9 November 2016
Revised: 4 December 2017
Accepted: 5 December 2017
First Online: 29 January 2018
Compliance with ethical standards
: RFL reports consulting for Cochlear Corp. and Advanced Bionics Corp. in the last two years. The remaining authors declare that they have no conflict of interest.