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APA Citation
Pennefather, P. M., Clarke, M. P., Strong, N. P., Cottrell, D. G., Dutton, J., & Tin, W. (1999). risk factors for strabismus in children born before 32 weeks' gestation. British journal of ophthalmology, 83(5), 514–518. http://access.bl.uk/ark:/81055/vdc_100135571563.0x00004f