1. Botulinum toxin improves pain in chronic anal fissure. Issue 6 (November 2017) Authors: Amorim, Hugo; Santoalha, José; Cadilha, Rui; Festas, Maria‐José; Barbosa, Paula; Gomes, Armanda Journal: Porto biomedical journal Issue: Volume 2:Issue 6(2017) Page Start: Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗