Erythrocyte transketolase activity, markers of cardiac dysfunction and the diagnosis of infantile beriberi by Soukaloun, D, Lee, S, Chamberlain, K, Taylor, A, Mayxay, M, Sisouk, K, Soumphonphakdy, B, Latsavong, K, Akkhavong, K, Phommachanh, D, Sengmeuang, V, Luangxay, K, McDonagh, T, White, N, Newton, P