1. Department of Community Medicine, Tirunelveli Medical college, Tirunelveli, Tamil Nadu, India,
2. Department of Community Medicine, Tuticorin Medical College, Thoothukudi, Tamil Nadu, India,
3. Department of Neurology, Tirunelveli Medical College, Tirunelveli, Tamil Nadu, India,
4. Model Rural Health Research Unit, Tirunelveli, Tamil Nadu, India,
5. Health Systems Research, ICMR-NIE, Chennai, Tamil Nadu, India,
6. Department of Pathology, Tirunelveli Medical College, Tirunelveli, Tamil Nadu, India,