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Dear Isaac, thank you for your time to post this important question. We proceed to respond and provide at the end more references.

Socioeconomic variation no doubt plays a role in undernutrition and stunting, especially when considering diarrhea and sanitation as the contributing factors, as was found by Checkley et al in 2004. Whether SES could be used to guide nutritional interventions would be greatly dependent on the variables being used to gauge SES and the range of variation within the population. It would seem logical to target low income communities prone to undernutrition as compared to national supplementary programs, which some have speculated result in increased inequality amongst the social classes, however this remains controversial (Oldroyd 2008).

Checkley W, Gilman RH, Black RE, Epstein LD, Cabrera L,Sterling CR, Moulton LH. 2004. Effect of water and sanitation on childhood health in a poor Peruvian peri-urban community. Lancet363(9403):112-118.

J Oldroyd, C Burns, P Lucas, A Haikerwal, E Waters. 2008. The effectiveness of nutrition interventions on dietary outcomes by relative social disadvantage: a systematic review. J Epidemiol Community Health;62:573-579.

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