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. 2022 Jun 15;13:897439. doi: 10.3389/fendo.2022.897439

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Copyright © 2022 Wen, Li, Cai, Fan, Wang, Ding, Huang and Xiao

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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Research area analysis of global publications in ONFH in the last 30 years. (A) Research areas in ONFH. (B) Radar map of research areas in ONFH during 1991-2000, 2001-2010 and 2011-2020.