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. 2022 Mar 28;17:194. doi: 10.1186/s13018-022-03068-7

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 3 — A International collaboration of countries in this domain. The area occupied per country is proportional to the number of documents. Line thickness reflects the closeness between countries, and a thicker line represents a stronger collaboration. B The annual number of publications in the top 10 prolific countries from 2001 to 2020. From 2010 onward, China has surpassed the USA for the first time and has remained that way since then. C The top 10 most active funding agencies in ONFH-related research. D The total number of publications, H-index, and average citations per item of top 10 most prolific countries in this field