1. Poliomyelitis (Heine-Medin disease).;Pearce;J Neurol Neurosurg Psychiatry,2005
2. Global Polio Eradication Initiative. History of polio [cited 2019 Jun 21]. http://polioeradication.org/polio-today/history-of-polio
3. Global Polio Eradication Initiative. Our mission [cited 2019 Jun 21] http://polioeradication.org/who-we-are/our-mission