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. 2019 Feb 4;9:4. doi: 10.3389/fcimb.2019.00004

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Copyright © 2019 Zeng, Gao, Peng, Wu, Zhu, Tan, Xia, You, Xu, Pan, Zhou, He and Yin.

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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Flow diagram describing the risk stratification process for all participants. LR, low-risk group; MR, medium-risk group; HR, high-risk group.