2184-0628 2184-0628 S2184-06282020000400396 10.29315/gm.v7i4.409 Japan 30 12 2020 30 12 2020 7 4 396 397 1 John Hopkins University 2 2020 370 m2815 3 2020 17 491-505 4 2020 5 2020 6 2020 9 484-5 7 2020 111 106424 8 2020 369 184-8