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. 2020 Nov 9;8:225703–225729. doi: 10.1109/ACCESS.2020.3036718

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This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/

This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/

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FIGURE 16. — Protocol used by number of apps.