" The implication of the sex ratios, Professor Sen found, is that about 107 million females are missing from the globe today. Follow-up studies have calculated the number slightly differently, deriving alternative figures for ‘missing women’ of between 60 million and 101 million. Every year, at least another 2 million girls worldwide disappear because of gender discrimination. "

― Nicholas D. Kristof , Half the Sky: Turning Oppression Into Opportunity for Women Worldwide