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. 2021 Nov 18;7(3):e001845. doi: 10.1136/rmdopen-2021-001845

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© Author(s) (or their employer(s)) 2021. 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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Consensus matrix to measure cluster stability. Cluster 1: VH-SWO/TEN cluster (n=187); cluster 2: H – TEN (n=251); cluster 3: H – feet – Dactylitis (n=175); cluster 4: L – nails –s kin (n=209); cluster 5: L–skin (n=283); cluster 6: L–nails (n=294); cluster 7: L (low) (n=495). H, high; L, low; SWO, swollen; TEN, tender; VH, very high.