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APA Citation
Amorim, H., Santoalha, J., Cadilha, R., Festas, M., Barbosa, P., & Gomes, A. (2017). botulinum toxin improves pain in chronic anal fissure. Porto biomedical journal, 2(6), . http://access.bl.uk/ark:/81055/vdc_100122865165.0x00001c