Analysis of in situ matrix metalloproteinase-1 coincentrations and clinical parameters in chronic adult periodontitis patients - Ristoska S., Ivanovski K., Panov S., Stefanovska E., Rendjova V., Pesevska S., Evrosimovska B., Mindova S., Dirjanska K., Mitik K. (Macedonian Dental Review 2018; 41 (3):89-94, 2018)