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1- https://blog.euromonitor.com/2017/08/... 2- https://www.statista.com/statistics/3... 3- https://qz.com/168690/where-the-world... 4- https://www.sciencelearn.org.nz/resou... 5 - https://www.ncbi.nlm.nih.gov/pubmed/1... 6- https://www.ncbi.nlm.nih.gov/pmc/arti... 7- https://www.ncbi.nlm.nih.gov/pmc/arti... 8- https://www.ncbi.nlm.nih.gov/pubmed/1... 9- https://www.ncbi.nlm.nih.gov/pmc/arti... 10 - https://www.ncbi.nlm.nih.gov/pubmed/1... 11- https://www.ncbi.nlm.nih.gov/pubmed/1... 12- https://www.ncbi.nlm.nih.gov/pubmed