Nguyen, Duc Ninh
Jiang, Pingping
Frøkiær, Hanne
Heegaard, Peter M. H.
Thymann, Thomas
Sangild, Per T.
Article History
Received: 8 August 2016
Accepted: 10 October 2016
First Online: 10 November 2016
Competing interests
: The authors declare no competing financial interests.