Text and Data Mining valid from 2018-04-01
Received: 24 December 2017
Accepted: 28 February 2018
First Online: 16 April 2018
Change Date: 11 December 2018
Change Type: Correction
Change Details: In the version of this Review Article originally published, the received and accepted dates were missing, and the published online date of 10 April 2018 was incorrect; they should have read ‘Received: 24 December 2017; Accepted: 28 February 2018; Published online: 16 April 2018’. This has now been corrected.
: T.S. is co-owner of SyTracks a/s, which commercializes the two-chamber system, COware.