Table 1.

Population of the sampling sites of the studied areas in Ilam Province, western Ilam

		Area of residence
County	Population	Urban	Rural	Nomads	No. of samples
Ilam	235,144	199,861	35,230	53	141
Dehloran	65,630	41,183	24,396	51	100
Mehran	29,797	19,186	10,516	95	118