Funding for this research was provided by:
Ministry of Economy, Trade and Industry (21U3044A)
Text and Data Mining valid from 2018-04-12
Received: 10 October 2017
Revised: 3 April 2018
Accepted: 4 April 2018
First Online: 12 April 2018
Compliance with ethical standards
: Takashi Kosugi and Haruo Isoda have received a Regional Innovation R&D Program grant from Japanese Ministry of Economy, Trade and Industry in 2009, 2010 (grant number, 21U3044A). Takafumi Kosugi is an employee of Renaissance of Technology Corporation. Takashi Kosugi is a stock holder and the president of Renaissance of Technology Corporation. Yoshiaki Komori is an employee of Siemens Healthcare K.K. The remaining authors have no conflict of interest.
: Our research project has been approved by our institutional review board (IRB). All procedures performed in studies involving human participants were in accordance with the ethical standards of the IRB and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study. This article does not contain any studies conducted on animals.