Neurotoxic envenoming by Indian krait (Bungarus caeruleus), cobra (Naja naja naja) and Russell's viper (Vipera russelli pulchella) in Anuradhapura, Sri Lanka: David A. Warrell1, Rodney E. Phillips1, R. David, G. Theakston2, Yamuna Galigedara3, D. T. D. J. Abeysekera3, P. Dissanayaka3, Ronald A. Hutton4 and Dennis J. Aloysius5 (1Nuffield Department of Clinical Medicine, University of Oxford; 2Liverpool School of Tropical Medicine, U.K.; 3Anuradhapura General Hospital, Sri Lanka; 4Royal Free Hospital, London, U.K.; and 5Galkissa Clinic, Dehiwala, Sri Lanka)