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WikiPedia: Hipotesis_kebersihan http://www.boston.com/news/science/articles/2007/1... http://www.nytimes.com/2007/11/27/health/27book.ht... http://www.springerlink.com/content/0byj25luk2l8e6... //www.ncbi.nlm.nih.gov/pmc/articles/PMC1299202 //www.ncbi.nlm.nih.gov/pmc/articles/PMC1774411 //www.ncbi.nlm.nih.gov/pmc/articles/PMC416594 //www.ncbi.nlm.nih.gov/pubmed/15007629 //www.ncbi.nlm.nih.gov/pubmed/15121715 //www.ncbi.nlm.nih.gov/pubmed/15577925 //www.ncbi.nlm.nih.gov/pubmed/15710972