@article {173043,
	title = {Gingival crevicular fluid levels of interleukin-18 and interleukin-21 in gingivitis and chronic periodontitis patients before and after non-surgical periodontal therapy.},
	journal = {Egyptian Dental Journal},
	year = {2013},
	author = {Shahira Elashiry and Enji Ahmed and Olfat Shaker}
}
