AVADAR (Auto-Visual AFP Detection and Reporting): demonstration of a novel SMS-based smartphone application to improve acute flaccid paralysis (AFP) surveillance in Nigeria oleh Faisal M. B. Shuaib, Philip F. Musa, Sisay Tegegne Gashu, Chima Onoka, Salihu Abdullahi Ahmed, Murtala Bagana, Michael Galway, Fiona Braka, Ticha Johnson Muluh, Richard Banda, Godwin Akpan, Ajiboye Tunji, Umar Kabo Idris, Adedolapo Olusoga, Patrick Briand, Nwanyibuife Obiako, Tonia Nebechukwu, Pascal Mkanda