A new monospecific ovine Fab fragment antivenom for treatment of envenoming by the Sri Lankan Russell's viper (Daboia Russelii Russelii): a preliminary dose-finding and pharmacokin... by Ariaratnam, C, Meyer, W, Perera, G, Eddleston, M, Kuleratne, SA, Attapattu, W, Sheriff, R, Richards, A, Theakston, R, Warrell, D