Ohoka, N
Nagai, K
Hattori, T
Okuhira, K
Shibata, N
Cho, N
Naito, M
Article History
Received: 9 June 2014
Revised: 22 September 2014
Accepted: 24 September 2014
First Online: 6 November 2014
Competing interests
: K Nagai and N Cho are employees of Takeda Pharmaceutical Co., Ltd. (Osaka, Japan). M Naito received a research fund from Takeda Pharmaceutical Co., Ltd. The other authors declare no conflict of interest.