Crowley, JJ, JR Mekkes, CC Zouboulis, N Scheinfeld, A Kimball, M Sundaram, Y Gu, MM Okun, and F Kerdel. 2014. “Association of hidradenitis suppurativa disease severity with increased risk for systemic comorbidities.” The British Journal of Dermatology 171 (6): 1561-1565. doi:10.1111/bjd.13122. http://dx.doi.org/10.1111/bjd.13122.