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APA Citation
Ardizzone, S., Maconi, G., Russo, A., Imbesi, V., Colombo, E., & Bianchi Porro, G. (2006). randomised controlled trial of azathioprine and 5-aminosalicylic acid for treatment of steroid dependent ulcerative colitis. Gut, 55(1), 47–53. http://access.bl.uk/ark:/81055/vdc_100137787669.0x000043