For the purpose of this review, the adolescent population
was defined as aged 11e19 years; however, since many studies
targeted youth (aged 15e24 years) along with adolescents,
exceptions were made to include studies targeting adolescents
and youth. Studies were excluded if they targeted age groups
other than adolescents and youth or did not report segregated
data for the age group of interest. Searches were conducted
till December 2014, and we did not apply any limitations on
the start search date or geographical settings. Outcomes
were not prespecified, and we included all the outcomes reported
by the study authors. We searched systematically
for existing reviews and took a systematic approach to
consolidate the existing evidence through the following
methodologies: