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See commentary on page 112
The authors report the following potential conflicts of interest or sources of funding: This work was supported by grants from the National Natural Science Foundation of China, China (Grant Nos. 81902208); Beijing Natural Science Foundation (grant No. 7172234); and Beijing Nova Program, China (Grant No. Z201100006820011) from Beijing Municipal Science & Technology Commission. ICMJE author disclosure forms are available for this article online, as supplementary material.Wei-Li Shi and Feng-Yi Hu contributed equally to this work.