Kimura, Masao http://orcid.org/0000-0001-8645-2224
Obayashi, Ippei http://orcid.org/0000-0002-7207-7280
Takeichi, Yasuo
Murao, Reiko
Hiraoka, Yasuaki
Article History
Received: 18 September 2017
Accepted: 12 February 2018
First Online: 23 February 2018
Competing Interests
: The authors declare no competing interests.