Definition of Moderate to Severe Hidradenitis Suppurativa: A Position Paper by the Canadian Hidradenitis Suppurativa Foundation (CHSF). Issue 6 (November 2016) - Alavi, Afsaneh; Adam, David N.; Alhusayen, Ra'ed; Boucier, Marc; Brassard, Alain; Coutts, Pat; Gooderham, Melinda; Gulliver, Wayne; Hong, Chih-ho; Lynde, Charles; Marcoux, Danielle; Papp, Kim; et al.