1. Division of Oncopathology; Malabar Cancer Centre, Thalassery, Kerala, India.
2. Division of Cancer Research, Regional Cancer Centre, Thiruvananthapuram, Kerala, India.
3. Division of Genetics and Cytogenetics; Malabar Cancer Centre, Thalassery, Kerala, India.
4. Department of Oral and Maxillofacial Surgery, Institute of Odontology; Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
5. Department of Oral Medicine and Pathology, Institute of Odontology; Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
6. Clinic of Oral Medicine, Public Dental Service, Gothenburg, Sweden.
7. Department of Oncology, Institute of Clinical Sciences; Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
8. Department of Oncology, Sahlgrenska University Hospital, Gothenburg, Sweden.