1. Department of Oral Pathology and Microbiology, Kannur Dental College, Anjarakandy, P.O. Mamba, Kannur 670611, India
2. Department of Oral Pathology and Microbiology, Azeezia College of Dental Science & Research, Diamond Hills, Meeyannoor, Kollam 691537, India
3. Department of Preventive and Community Dentistry, Kannur Dental College, Anjarakandy, P.O. Mamba, Kannur 670611, India