Two surprise results from India’s biggest trial

BMJ 2013; 346 doi: http://dx.doi.org/10.1136/bmj.f1796 (Published 20 March 2013)
Cite this as: BMJ 2013;346:f1796

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In one of the biggest trials ever completed, vitamin A supplements failed to prevent deaths among preschool children in rural north India. The headline result was a surprise in this moderately deficient population, and the researchers spent years checking their data …

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