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APA Citation
Pisipati, S., Song, K., Kagbo-Kue, S., Leighton, J. A., Ruff, K. C., & Ramirez, F. C. (n.d.). s563 Diagnostic Yield of Upper and Lower Endoscopic Biopsies for Evaluation of Suspected Acute Gastrointestinal Graft-Versus-Host Disease. American journal of gastroenterology, 116, S257. http://access.bl.uk/ark:/81055/vdc_100144523821.0x000009