Assessment of cataract surgical outcomes in settings where follow-up is poor: PRECOG, a multicentre observational study by Prof. Nathan Congdon, MD, Xixi Yan, MD, Van Lansingh, MD, Alemayehu Sisay, MD, Andreas Müller, PhD, Ving Chan, OD, Ling Jin, MS, Mirjam E Meltzer, PhD, Sasipriya M Karumanchi, MHM, Chunhong Guan, MSc, Quy Vuong, MD, Nelson Rivera, OD, Joan McCleod-Omawale, PhD, Prof. Mingguang He, MD

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