Wieringa FT, Dijkhuizen MA, West CE, van der Ven-Jongekrijg J, Muhilal, van der Meer JWM. Reduced production of immunoregulatory cytokines in vitamin A- and zinc-deficient Indonesian infants. European Journal of Clinical Nutrition. 2004 May 26;58(11):1498–504. doi: 10.1038/sj.ejcn.1601998.