Funding for this research was provided by:
Japan Society for the Promotion of Science (16J04692, 18H02506)
Far East Branch, Russian Academy of Sciences (17-007)
Vietnam Academy of Science and Technology (VAST.HTQT.NGA.01/17-18)
Article History
Received: 25 April 2020
Accepted: 9 October 2020
First Online: 30 October 2020
Competing interests
: The authors declare no competing interests.