Fujii, S
Matsumoto, S
Nojima, S
Morii, E
Kikuchi, A
Article History
Received: 7 August 2014
Revised: 29 October 2014
Accepted: 30 October 2014
First Online: 8 December 2014
Competing interests
: SF, SM and AK have received research funds from Shionogi and Co., Ltd. The remaining authors declare no conflict of interest.