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"Economic instability leads to political instability, which leads to civil war, riots and political unrest," he said, adding that countries that are already going through hard times economically are more vulnerable to such impact.

"Depending on how fast this [review] is really accomplished, we might get an authorization, or conditional approval already in 2020, which might help us start distribution of the first vaccine batches already in 2020," Sahin told CNN.

"Diabetes has become more common across China," said Zhang Yuxin, a professor at the School of Public Health, China Medical University, Shenyang, Liaoning province.

"Different from past scenarios, in late October the A-share market had reached its historically low valuation level, and investors have formed expectations of serial bailouts and market-boosting reforms," said Hong Rong, founder of investor education platform Hongda Education and an MBA tutor at the Shanghai Advanced Institute of Finance.

"During the 'cultural revolution' (1966-76), it was hard to get books. I needed to wait for a week to borrow one and had only two days to finish reading it. I had many regrets because I hadn't finished reading most of the novels," he said.