Fig 1.
Flow diagram of the selection of the studies.
Table 1.
Characteristics of studies selected for this review.
Fig 2.
Forest plot of studies submitted to meta-analysis.
(a1 and a2) = with reference to the study of Prestwich et al. [38].
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Flow diagram of the selection of the studies.
Characteristics of studies selected for this review.
Forest plot of studies submitted to meta-analysis.
(a1 and a2) = with reference to the study of Prestwich et al. [38].