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Of the nine full-text articles obtained, one was a narrative review [ 30], one had a retrospective design [ 31], one had a cross-sectional design [ 32] and three were based on secondary analysis of other studies [ 33- 35] leaving only three original studies for the final review [ 36- 38].
The methodology of the study is the documentary approach and is based on secondary analysis of the statistics provided by international organizations and other findings relevant to the subject of the study.
As this study is based on secondary analysis of existing DHS data that are in the public domain, we did not seek approval from an Institutional Review Board.
It is interesting to note, nonetheless, that we found that a high percentage of circulating influenza A H3N2viruses are resistant to antiviral drugs such as Amantadine based on secondary analysis of these isolates [22].
This study is based on secondary analysis of existing survey data with all identifying information removed.
The study was based on secondary analysis of the Maternity Experiences Survey.
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Our manuscript was based on secondary analysis data of the survey.
This study is based on secondary analysis, using information from two available databases, of which UNAIDS endorses one and UNFPA the other [ 47, 48].
The research is based solely on secondary analysis of anonymised personal records which are archived and available to researchers using the respective study's data access route.
This survey was based on secondary data analysis of a comprehensive Multiple Indicator Cluster Survey (MICS).
The study was based on secondary data analysis of anonymised data which had previously been published and disseminated in individual audit reports from each of the three initiatives therefore ethical approval was not sought for the collated secondary analysis.
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