O. E. Orisakwe, H. O. C. Mbagwu, G. C. Ajaezi, U. W. Edet, and P. U. Uwana, “Heavy Metals in Seafood and Farm Produce from Uyo, Nigeria : Levels and health implications”, Sultan Qaboos Univ Med J, vol. 15, no. 2, pp. 275–282, May 2015.