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. 2019 Jan 15;7(1):e12297. doi: 10.2196/12297

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©Xinghan Wu, Xitong Guo, Zhiwei Zhang. Originally published in JMIR Mhealth and Uhealth (http://mhealth.jmir.org), 15.01.2019.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR mhealth and uhealth, is properly cited. The complete bibliographic information, a link to the original publication on http://mhealth.jmir.org/, as well as this copyright and license information must be included.

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Trim and fill plot of publication bias. HbA_1c: glycated hemoglobin; open circles: estimated unpublished studies with negative findings.