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WikiPedia: Tư_thế_ngủ http://www.cbc.ca/news/background/health/sleep.htm... //edwardbetts.com/find_link?q=T%C6%B0_th%E1%BA%BF_... http://www.umm.edu/patiented/articles/what_lifesty... //pubmed.ncbi.nlm.nih.gov/9001312 http://www.aaoms.org/sleep_apnea.php http://ajrccm.atsjournals.org/cgi/content/abstract... //doi.org/10.1164%2Fajrccm.155.1.9001312 http://ije.oxfordjournals.org/cgi/reprint/dyi088v1... //en.wikipedia.org/wiki/Oxford_University_Press http://news.bbc.co.uk/2/hi/5415052.stm