Li, Shizhong
Hauser, Frank
Skadborg, Signe K.
Nielsen, Stine V.
Kirketerp-Møller, Nikolaj
Grimmelikhuijzen, Cornelis J. P.
Article History
Received: 17 November 2015
Accepted: 16 August 2016
First Online: 15 September 2016
Competing interests
: The authors declare no competing financial interests.