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aInstitute of Policy Studies, Lee Kuan Yew School of Public Policy, National University of Singapore, Singapore 259599; bPopulation Estimates and Projections Section, United Nations Population Division, Department of Economic and Social Affairs, United Nations, New York, NY 10017; cSaw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore 117549; and dDepartment of Biostatistics and Epidemiology, School of Public Health and Health Sciences, University of Massachusetts, Amherst, MA 01003-9304

proceedings of the national academy of sciences of the united states of america

Correction for Chao et al., Systematic assessment of the sex ratio at birth for all countries and estimation of national imbalances and regional reference levels