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Hampshire, R.; Wharton, H.; Leigh, R.; Wright, A.; Dodson, P. . (2013). Screening for diabetic retinopathy in pregnancy using photographic review clinics. Diabetic Medicine, 30(4), 475–477. doi:10.1111/dme.12077 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research