#20 Design and rationale of the PIlonidal sinus Treatment - STudying the OPtions (PITSTOP) study: a multicentre cohort, nested mixed-methods case study and discrete choice experiment (poster presentation). (November 2018) - Beal, E.; Hind, D.; Bradburn, M.; Lee, E.; Howard, A.; Shackley, P.; Lee, M.; Brown, S.