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. 2022 Dec 1;12(12):e060753. doi: 10.1136/bmjopen-2022-060753

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© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Forest plot of volatile sulfur compound (VSC) subgroups in the long term (>4 weeks): (A) hydrogen sulfide (H₂S); (B) methyl mercaptan (CH₃SH); (C) dimethyl sulfide (C₂H₆S).