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Sri Lanka Demographic and Health Survey On follow-up time interval in estimation and comparison of two rates in demographic studies. Gender bias: Roadblock to sustainable development. Unpublished figures from Demographic Surveillance System, Matlab. This analysis follows earlier research that hypothesized and substantiated that, in a society with strong son preference, its effect on fertility would be conditional on the level of contraceptive use. Reading, MA: Addison-Wesley. Gender preference and birth spacing in Matlab, Bangladesh, Demography — Biological sex differences with special reference to disease, resistance and longevity, Journal of Obstetrics and Gynaecology of the British Empire —

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