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Clark K, Currow DC, Agar M, Fazekas BS, Abernethy AP.Clark K, et al. Among authors: fazekas bs.J Pain Palliat Care Pharmacother. 2008;22(2):131-8. doi: 10.1080/15360280801992058.J Pain Palliat Care Pharmacother. 2008.PMID: 19042837Clinical Trial.