Sadia Musharraf, Waleed Ahmed Ismail, Nasar Um Min Allah, Zubair Nasir, Syed Ali Asad Raza Naqvi, and Waleed Mushtaq, “KNOWLEDGE OF MEDICAL DOCTORS IN TWIN CITIES OF PAKISTAN ABOUT THE RELATIONSHIP BETWEEN PERIODONTAL DISEASE AND SYSTEMIC HEALTH”, PODJ, vol. 41, no. 4, pp. 232-236, Dec. 2021.