Lu, Yongping
Shimojima, Keiko
Sakuma, Tomoko
Nakaoka, Sachiko
Yamamoto, Toshiyuki http://orcid.org/0000-0002-9484-3505
Article History
Received: 1 August 2016
Revised: 23 October 2016
Accepted: 24 October 2016
First Online: 5 January 2017
Competing interests
: The authors declare no conflict of interest.