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. 2020 Aug;12(8):4434–4449. doi: 10.21037/jtd-20-2363

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2020 Journal of Thoracic Disease. All rights reserved.

Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0.

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Effect of travel restrictions on chunyun migration patterns in mainland China. Migration indices for the 2019 (orange) and 2020 (green) on the 7th day of the Spring Festival, typically the peak of migration, in different provinces in mainland China. Values show the difference in migration index in each province between 2019 and 2020. Migration index based on the daily number of inbound and outbound events by rail, air and road traffic, were sourced from a web-based program: Baidu qianxi (in Chinese) (https://qianxi.baidu.com/).