Liu, Chang http://orcid.org/0000-0003-2859-4288
Cheng, Ying-Juan
Wang, Jia-Wei
Weigel, Detlef http://orcid.org/0000-0002-2114-7963
Article History
Received: 26 January 2017
Accepted: 14 July 2017
First Online: 28 August 2017
Competing interests
: The authors declare no competing financial interests.