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APA Citation
Safi, A., Grandoch, A., Nickenig, H., Zöller, J. E., & Kreppel, M. (2017). the importance of lymph node ratio for locoregional recurrence of squamous cell carcinoma of the tongue. Journal of cranio-maxillofacial surgery, 45(7), 1058–1061. http://access.bl.uk/ark:/81055/vdc_100046822211.0x00002d