Luo, Zhi-Xiang http://orcid.org/0000-0002-2719-1025
Xing, Yun-Zhao
Ling, Yan-Chun
Kleinhammes, Alfred
Wu, Yue
Article History
Received: 17 September 2014
Accepted: 23 January 2015
First Online: 20 February 2015
Competing interests
: The authors declare no competing financial interests.