Treatment of Hidradenitis Suppurativa Evaluation Study (THESEUS): protocol for a prospective cohort study oleh Rachel Howes, Kerenza Hood, Emma Thomas-Jones, Rebecca Cannings-John, Paul Leighton, Kim Suzanne Thomas, Jeremy Rodrigues, Laura M Howells, Helen Stanton, John R Ingram, Janine Bates, Fiona Collier, Ceri Harris, Angela Gibbons