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Johansson JE, Adami HO, Andersson SO, Bergström R, Krusemo UB, Kraaz W.Johansson JE, et al. Among authors: bergstrom r.Lancet. 1989 Apr 15;1(8642):799-803. doi: 10.1016/s0140-6736(89)92269-1.Lancet. 1989.PMID: 2564901Clinical Trial.