Iris Slutzky-Goldberg, Baev, Valery , Volkov, Alexander , Zini, Avi , and Tsesis, Igor . 2013. “Incidence Of Cholesterol In Periapical Biopsies Among Adolescent And Elderly Patients”. Journal Of Endodontics, 39, Pp. 1477 – 1480. doi:10.1016/j.joen.2013.08.008.