Additional file 4.

Data Extraction Results for Included Studies Rated Strong. This file contains the data extraction results for the 4 studies included in this review that were rated as strong after being assessed for methodological quality. Data includes authors, date of publication, country, study design, setting, participants, interventions, outcome measurements, and key findings and limitations.

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Cancelliere et al. BMC Public Health 2011 11:395   doi:10.1186/1471-2458-11-395