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APA Citation
Iftikhar, M., Lemus, M., Usmani, B., Campochiaro, P. A., Sahel, J. A., Scholl, H. P. N., & Shah, S. M. A. (2019). classification of disease severity in retinitis pigmentosa. British journal of ophthalmology, 103(11), 1595–1599. http://access.bl.uk/ark:/81055/vdc_100135166405.0x00004d