Production diseases in smallholder pig systems in rural Lao PDR by Holt, H, Inthavong, P, Blaszak, K, Keokamphe, C, Phongmany, A, Blacksell, S, Durr, P, Graham, K, Allen, J, Donnelly, B, Newberry, K, Grace, D, Alonso, S, Gilbert, J, Unger, F