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- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7700832/
- https://www.ijhsr.org/IJHSR_Vol.10_Issue.9_Sep2020/38.pdf
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3552974/
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3991951/
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