We believe that, in such appraisals, data from both eyes should be used.
As summarized in Figure 1, the review followed the main phases that have been systematized in previous works: literature searches, screenings and appraisals, data extraction, and analysis and interpretative synthesis [ 21, 22].
S.G. did data extraction, critical appraisal, data analysis, data interpretation and writing of the report.
S.G. did data extraction, critical appraisal, data analysis and interpretation and writing of the report.
J.B. and C.M.V. did critical appraisal, data interpretation and writing of the report.
J.B., L.P. and C.M.V. did critical appraisal, data interpretation and writing of the report.
Paper inclusion, quality appraisal, data extraction and data synthesis were undertaken by one of the authors (JM).
Study selection, appraisal, data extraction and quality assessment were performed by one reviewer and independently checked by another.
NB conducted the searches, quality appraisal, data extraction processes, analyses of evidence and synthesis of evidence, with support from JN, RTE and NH.
As the identified literature was heterogeneous, a modified narrative synthesis [ 17] framework for mixed-methods reviews was applied during the quality appraisal, data extraction, analysis, and synthesis stages.
The study further examined papers identified in a prior review which had used established systematic review methods (encompassing identification of papers by developing a search strategy, electronic database searching and sifting, reference list checking, citation searching, quality appraisal, data extraction and narrative synthesis).
