Erel, F., Sener, O., Erdil, A., Karaayvaz, M., Gur, G., Caliskaner, Z., Ozanguc, N. (2000)Impact of Helicobacter pylori and Giardia lamblia infections on chronic urticaria, J Investig Allergol Clin Immunol. , 10(2), pp. 94-7.