1. Department of Community Medicine, P K Das Institute of Medical Sciences, Vaniyamkulam, Palakkad, Kerala, India
2. Department of Community Medicine, KMCT Medical College, Mukkam, Kozhikode, Kerala, India
3. Department of Health Services, Community Health Centre, Pattiam, Kannur, Kerala, India
4. Department of General Medicine, Taluk Hospital, Feroke, Kozhikode, Kerala, India