The research is based on four case reports .
The research is based on four case studies .
Contemporary source material was used to analyze___
Contemporary source material was used to examine___
This work offers a novel approach to quantifying ___ using___
This study provides a novel approach to quantifying ___ using___
This work employed a phenomenographic approach to discover the___
This study used a phenomenographic approach to identify the___
This work applied a phenomenographic approach to discover the___
This survey employed a phenomenographic approach to discover the___
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