Lian, Zhong
Nielsen, Dennis U.
Lindhardt, Anders T.
Daasbjerg, Kim
Skrydstrup, Troels
Article History
Received: 23 June 2016
Accepted: 1 November 2016
First Online: 16 December 2016
Competing interests
: A.T.L. and T.S are co-owners of SyTracks a/s, which commercialises COtube, COware and COgen. The remaining authors declare no competing financial interests.