Nwaopara, A. et al. 2008. A Comparative Study on the Effects of Excessive Consumption of Ginger, Clove, Red Pepper and Black Pepper on the Histology of the Kidney. Pakistan Journal of Nutrition. 7, 2 (Feb. 2008), 287–291. DOI:https://doi.org/10.3923/pjn.2008.287.291.