Sadia Musharraf; Waleed Ahmed Ismail; Nasar Um Min Allah; Zubair Nasir; Syed Ali Asad Raza Naqvi; Waleed Mushtaq. KNOWLEDGE OF MEDICAL DOCTORS IN TWIN CITIES OF PAKISTAN ABOUT THE RELATIONSHIP BETWEEN PERIODONTAL DISEASE AND SYSTEMIC HEALTH. Pak Oral Dent J 2021, 41 (4), 232-236.