What were the serious limitations identified in the studies?
The serious limitations identified in the studies included the secondary use of data and the subsequent inability to assess their methodology in detail, along with vague description of the analysis; lack of richness of data, context and the role of the researcher, as well as a lack of information on data collection in one study and the reasoning for the choice of methods in the other; and limited information on the background and reflection of the researcher, data collection, data richness, relevance of findings and link to conclusions.