The triangular nasal notch sign in patients with Crohn disease treated with tumour necrosis factor inhibitors. - Mesnard, C.; Aubert, H.; Bourreille, A.; Trang, C.; Gagey‐Caron, V.; Le Corre, Y.; Topin Ruiz, S.; Barbarot, S. (British Journal of Dermatology, 2019)