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While the assessment of study quality is encouraged, it is important to point out that such assessment carries significant subjectivity. Consequently, such analyses should be interpreted with caution. There are a number of different scales and checklists currently available for the assessment of study quality (See: Moher D, Jadad AR, Nichol G, Penman M, Tugwell P, Walsh S. Assessing the quality of randomized controlled trials: An annotated bibliography of scales and checklists. Controlled Clinical Trials 16:62-73, 1995).