a) is true but I think b) is because they normalized for China's age structure.
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I found new numbers: 8 dead now, 15 in serious condition https://translate.google.com/translate?hl=de&sl=ja&tl=en&u=https%3A%2F%2Fwww.mhlw.go.jp%2Fstf%2Fnewpage_10201.html …
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