TNFSF13 and hidradenitis suppurativa: APRIL, A proliferation-inducing ligand; BAFF, B cell-activating factor; CSF1, colony-stimulating factor 1; GM-CSF, granulocyte-macrophage colony-stimulating factor; HS, hidradenitis suppurativa; IFN, interferon; IFN-γ, interferon gamma; IFNLR1, type I interferon receptor; mTOR, mammalian target of rapamycin; mTORC1, mammalian target of rapamycin complex 1; TNF-α, tumor necrosis factor-alpha