Prototype Positive Control Wells for Malaria Rapid Diagnostic Tests: Prospective Evaluation of Implementation among Health Workers in Lao People's Democratic Republic and Uganda. by Bell, D, Bwanika, J, Cunningham, J, Gatton, M, González, I, Hopkins, H, Kibira, S, Kyabayinze, D, Mayxay, M, Ndawula, B, Newton, P, Phommasone, K, Streat, E, Umlauf, R