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. 2022 Sep 4;31(Suppl 1):33–39. doi: 10.1111/exd.14609

FIGURE 1.

FIGURE 1

“Onion skin model” of the core outcome set for hidradenitis suppurativa (HS) clinical trials, showing domains and their constituent items. The left‐hand circle is the core domain set, with inclusion of the symptoms domain as well. Patient‐reported outcomes are highlighted in red. Reproduced with permission 15