The effects of a traditional drug, turmeric (curcuma longa), and placebo on the healing of duodenal ulcer/ by Van Dau, N, Ngoc Ham, N, Huy Khac, D, Thi Lam, N, Tong Son, P, Thi Tan, N, Duc Van, D, Dahlgren, S, Grabe, M, Johansson, R, Lindgren, R, Stjernstrom, N