source https://www.bbc.co.uk/news/health-56132291
Coronavirus doctor's diary: Don't ask me which vaccine is best, please
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Dr John Wright says he's often asked which vaccine is best, but the answer is it's too early to say.
source https://www.bbc.co.uk/news/health-56132291
source https://www.bbc.co.uk/news/health-56132291
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