Schmale, Julia
Flanner, Mark
Kang, Shichang
Sprenger, Michael
Zhang, Qianggong
Guo, Junming
Li, Yang
Schwikowski, Margit
Farinotti, Daniel
Article History
Received: 17 October 2016
Accepted: 7 December 2016
First Online: 12 January 2017
Competing interests
: The authors declare no competing financial interests.