Defining the burden of febrile illness in rural South and Southeast Asia: an open letter to announce the launch of the Rural Febrile Illness project by Chandna, A, Chew, R, Shwe Nwe Htun, N, Peto, T, Zhang, M, Liverani, M, Brummaier, T, Phommasone, K, Perrone, C, Phyo, AP, Ibna Zaman, S, Sandar Zaw, A, Batty, E, Waithira, N, Abdad, MY, Blacksell, S, Bodhidatta, L, Callery, J, Fagnark, W, Huangsuranun, W, Islam, S, Lertcharoenchoke, S, Lohavittayavikant, S, Mukaka, M, Pongvongsa, T, Ponsap, P, Richard-Greenblatt, M, Schilling, WHK, Thaipadungpanit, J, Tripura, R, Dondorp, A, Mayxay, M, White, N, Nosten, F, Smithuis, F, Ashley, E, Maude, R, Day, NPJ, Lubell, Y, Et al