著者名,タイトル,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) Sak,Comparing the quality of pro- and anti-vaccination online information: a content analysis of vaccination-related webpages,BMC Public Health,,,2016,16,,1,https://cir.nii.ac.jp/crid/1370851165461171473,