Sakai, Hiroyuki
Ando, Takafumi
Sadato, Norihiro
Uchiyama, Yuji
Article History
Received: 2 August 2016
Accepted: 14 March 2017
First Online: 18 April 2017
Competing interests
: The authors declare that this work was performed under the financial support of Toyota Central R&D Laboratories, Inc., which is funded by its stockholding companies (http://www.tytlabs.co.jp/ english/comp/outline02.html). The funders had no role in the study design, data collection and analysis, or the decision to publish.