International Journal of Epilepsy [Thieme Medical and Scientific Publishers Private Ltd. 20th Joint Annual Conference of Indian Epilepsy Society and Indian Epilepsy Association - Nehru Place, New Delhi, India (2019.03.08-2019.03.10)] 20th Joint Annual Conference of Indian Epilepsy Society and Indian Epilepsy Association - Changing Trends of Subacute Sclerosing Panencephalitis— Pre- and Postvaccination Era, Why Should Children Vaccinated against Measles Develop SSPE?