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Congdon, Nathan and Yan, Xixi and Lansingh, Van and Sisay, Alemayehu and Müller, Andreas and Chan, Ving and Jin, Ling and E Meltzer, Mirjam and M Karumanchi, Sasipriya and Guan, Chunhong and Vuong, Quy and Rivera, Nelson and McCleod-Omawale, Joan and He, Mingguang (2013) Assessment of cataract surgical outcomes in settings where follow-up is poor: PRECOG, a multicentre observational study. The Lancet Global Health, 1 (1). e37-e45. ISSN 0140-6736