TY - GEN T1 - #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) PY - 2018/11/02 AU - Beal E AU - Hind D AU - Bradburn M AU - Lee E AU - Howard A AU - Shackley P AU - Lee M AU - Brown S ED - Y2 - 2025/06/23 ER -