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. 2020 Jun 15;10(6):e037125. doi: 10.1136/bmjopen-2020-037125

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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Sampling and procedure: The sample was drawn from a national administrative database of all residents in Singapore which served as a sampling frame. Household surveys are being conducted among those who provide written informed consent.