Li, Guixin
Chen, Shumei
Pholchai, Nitipat
Reineke, Bernhard
Wong, Polis Wing Han
Pun, Edwin Yue Bun
Cheah, Kok Wai
Zentgraf, Thomas
Zhang, Shuang
Article History
Received: 20 October 2014
Accepted: 6 March 2015
First Online: 13 April 2015
Competing interests
: The authors declare no competing financial interests.