Li, Lili
Kromann, Sofie
Olsen, John Elmerdahl
Svenningsen, Søren Wedel
Olsen, Rikke Heidemann
Article History
Received: 4 April 2017
Revised: 2 June 2017
Accepted: 8 June 2017
First Online: 12 July 2017
Competing interests
: The authors declare no conflict of interest.