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Bruera E, de Stoutz N, Velasco-Leiva A, Schoeller T, Hanson J.Bruera E, et al. Among authors: hanson j.Lancet. 1993 Jul 3;342(8862):13-4. doi: 10.1016/0140-6736(93)91880-u.Lancet. 1993.PMID: 8100289Clinical Trial.