Funding for this research was provided by:
Ministry of Science and Technology of the People's Republic of China (2014DFA31130)
Shanghai Science and Technology Development Foundation (15DZ2291600)
Text and Data Mining valid from 2018-06-18
Received: 31 March 2018
Accepted: 23 May 2018
First Online: 18 June 2018
Ethics approval and consent to participate
: Not applicable.
: The authors have no relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript. This includes employment, consultancies, honoraria, stock ownership or options, expert testimony, grants or patents received or pending, or royalties.