Funding for this research was provided by:
New Energy and Industrial Technology Development Organization (Industrial Technology Research Grant Program in 2004-2006 (04A33519))
Text and Data Mining valid from 2018-07-20
Received: 17 April 2018
Accepted: 9 July 2018
First Online: 20 July 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.