Spiroski, M. Z. (2019) “Retraction: Singhal R, Rai B. sTNF-R Levels: Apical Periodontitis Linked to Coronary Heart Disease. Open Access Maced J Med Sci. 2017; 5(1):68-1 and Rai B, Kaur J, Jain R. Salivary and serum 8-hydroxydeoxyguanosine level in simulated microgravity. Maced J”, Open Access Macedonian Journal of Medical Sciences, 7(10), pp. 1691–1691. doi: 10.3889/oamjms.2019.225.