Funding for this research was provided by:
the Ministry of Science and ICT (H‐GUARD_2013M3A6B2078950)
Ministry of Science and ICT (NRF-2019R1C1C1006084, NRF-2019R1C1C1006867)
Text and Data Mining valid from 2020-04-11
Received: 17 October 2019
Accepted: 31 March 2020
First Online: 11 April 2020
: The authors declare that they have no competing interests.