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Pearl A, Wright SP, Gamble GD, Muncaster S, Walsh HJ, Sharpe N, Doughty RN.Pearl A, et al. Among authors: doughty rn.Fam Pract. 2003 Dec;20(6):642-5. doi: 10.1093/fampra/cmg604.Fam Pract. 2003.PMID: 14701886Clinical Trial.