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. 2021 Dec 16;8:719866. doi: 10.3389/fmolb.2021.719866

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Copyright © 2021 He, Yang, Huang, Tian, Pei, Bohn, Zou, Wang, Li, Wang, Gu, Jiang, Chen, Zou, Wei, Tian, Tang, Adeli and Wang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The contribution and distribution of study centers/laboratories at each province/municipality. Figure 1A, the number and location of participating centers/laboratories; Figure 1B, the sample size at each province/municipality. The superscript capital P means the number of participating centers/laboratories. HL, Heilongjiang; JL, Jilin; LN, Liaoning; XJ, Xinjiang; IM, Inner Mongolia; TJ, Tianjin, HE, Hebei; SX, Shanxi; SN, Shaanxi; NX, Ningxia; GS, Gansu; QH, Qinghai; SD, Shandong; JS, Jiangsu; AH, Anhui; HA, Henan; SH, Shanghai; HB, Hubei; CQ, Chongqing; SC, Sichuan; XZ, Tibet; ZJ, Zhejiang; JX, Jiangxi; HN, Hunan; GZ, Guizhou; YN, Yunnan; FJ, Fujian; TW, Taiwan; GD, Guangdong; GX, Guangxi; HK, Hongkong; MC, Macau. Areas with no data submitted show no color. The darker in orange, the larger in sample size.