Pretell Zárate, E. A., and A. M. Higa Yamashiro. “Sustained Elimination of Iodine Deficiency Disorders in Peru: 25 Years Experience”. ACTA MEDICA PERUANA, Vol. 25, no. 3, Sept. 2008, pp. 128 -34, http://54.39.98.165/index.php/AMP/article/view/1405.