Ahmadi-Motamayel, F.; Falsafi, P.; Goodarzi, M. T.; Poorolajal, J. Comparison of Salivary PH, Buffering Capacity and Alkaline Phosphatase in Smokers and Healthy Non-Smokers : Retrospective Cohort Study. Sultan Qaboos Univ Med J 2016, 16, 317-321.