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. 2021 Feb 5;6(2):e003585. doi: 10.1136/bmjgh-2020-003585

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See: https://creativecommons.org/licenses/by/4.0/.

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Geographical density of the number of dietary surveys in the GDD 2017 by country (A), including publicly available surveys (B) and non-public surveys submitted by data owners (corresponding members) (C). GDD, Global Dietary Database.