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http://dpc10.ddc.moph.go.th/nana/doc16.htmlhttp://www.rcost.or.th/web/index.php?option=com_content&view=article&id=8:2010-01-28-07-13-35&catid=19&Itemid=109&lang=enhttp://www.si.mahidol.ac.th/sidoctor/e-pl/articledetail.asp?id=154