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Botox treatment in patients with chronic functional anorectal pain: experiences of a tertiary referral proctology clinicOoijevaar, R. E.; Felt-Bersma, R. J. F.; Han-Geurts, I. J.; van Reijn, D.; Vollebregt, P. F.; Molenaar, C. B. H. · Techniques in Coloproctology · 2019