href="#ulink_ec67ef91-76a6-54e3-9c2f-57164aac0f3f">Williamson et al., 2004.
21. Some of these calculations can be found in Stoltzfus et al., 1997a; and Stoltzfus et al., 1997b. They are summarized in Crompton, 2000; and Crompton and Nesheim, 2002. The link between moderate and heavy hookworm infections and intestinal blood loss leading to iron deficiency anemia was recently confirmed in a systematic review; see Smith and Brooker, 2010.
22. The global importance of hookworm in pregnancy is highlighted in Bundy et al., 1995; and Christian et al., 2004. A recent systematic review confirmed the link between hookworm and anemia in pregnancy and provided the estimate of the number of hookworm-infected pregnant women in sub-Saharan Africa; see Brooker et al., 2008.
23. Data are summarized in Hotez et al., 2006b. New information about years lost from disability can be found in Vos et al., 2012.
24. Information on the control of STH infections through deworming is summarized in Albonico et al., 2006; Brooker et al., 2004; and Crompton and Nesheim, 2002. The educational and economic benefits of deworming are discussed in Miguel and Kremer, 2004; Baird et al., 2012; and Bleakley, 2007. Some of these studies operate under the auspices of the innovative Abdul Latif Jameel Poverty Action Lab, based at Massachusetts Institute of Technology (www.povertyactionlab.org), and the Partnership for Child Development in London (www.child-development.org). Some investigators consider the improvements in child cognition that result from deworming to be marginal or controversial; see Taylor-Robinson et al., 2012. This paper stimulated a lively debate (in which I participated) published as a blog in the PLOS Medicine Speaking of Medicine community blog (PLOS Medicine, 2012).
25. Hotez et al., 2006a; World Bank, 2003.
26. Savioli et al., 1992.
27. Estimates of the scope of global deworming and other NTD interventions are in World Health Organization, 2012.
28. The information about resistance is summarized in Brooker et al., 2004. The systematic review of the efficacy of drugs for STH infections is found in Keiser and Utzinger, 2008.
29. This information is summarized in Magalhaes et al., 2011,.
30. This information is summarized in Hotez et al., 2010.
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