Nakata, M
Yamamoto, S
Okada, T
Gantulga, D
Okano, H
Ozawa, K
Yada, T
Article History
Received: 2 March 2015
Revised: 25 August 2015
Accepted: 30 August 2015
First Online: 5 October 2015
Competing interests
: HO is a paid member of scientific advisory board for San Bio, Co. Ltd. The other authors declare no conflict of interest.