Every reference with a DOI in the deposited reference list resolved to a known
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The 12 references without a DOI — listed, not checked
no DOI — not checkedBaltar F, Brunet I. Social research 2.0: virtual snowball sampling method using Facebook. Internet research; 2012.
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no DOI — not checkedDuggan M, Brenner J. The demographics of social media users, 2012, vol. 14. Washington, DC: Pew Research Center’s Internet & American Life Project; 2013.
no DOI — not checkedFox S, Jones S. The social life of health information. Washington, DC: Pew internet & American life project; 2009.
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no DOI — not checkedMassey, E.. A sermon against the dangerous and sinful practice of inoculation. 1722. William Meadows.
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no DOI — not checkedPoushter J, Bishop C, Chwe H. Social media use continues to rise in developing countries but plateaus across developed ones. Pew Res Cent. 2018;22:2–19.
no DOI — not checkedUNICEF. Tracking anti vaccination sentiment in eastern European social media networks. New York: UNICEF; 2013.
no DOI — not checkedWorld Health Organization. Considerations regarding consent in vaccinating children and adolescents between 6 and 17 years old (No. WHO/IVB/14.04): World Health Organization; 2014.
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