Table 1.

Example of classification of webpages.

Positive stance on vaccines
https://www.historyofvaccines.org/content/articles/do-vaccines-cause-autism https://www.nhs.uk/news/medication/no-link-between-mmr-and-autism-major-study-finds/ https://www.nhs.uk/conditions/vaccinations/mmr-vaccine/ https://www.autism.org.uk/get-involved/media-center/position-statements/mmr-vaccine.aspx https://kidshealth.org/en/parents/autism-studies.html https://vaccine-safety-training.org/mmr-vaccine-increases.html https://www.nejm.org/doi/full/10.1056/NEJMoa021134 https://www.ncbi.nlm.nih.gov/pubmed/30986133 https://www.ncbi.nlm.nih.gov/pubmed/15366972
Negative stance on vaccines
https://www.thelancet.com/journals/lancet/article/PIIS0140673605756968/fulltext www.whale.to/vaccine/vaccine_autism_proven.html www.vaccineriskawareness.com/Infant-Vaccines-Produce-Autism-Symptoms-In-Primates https://leftbrainrightbrain.co.uk/2014/07/17/more-of-that-vaccineautism-research-that-doesnt-exist/ edition.cnn.com/2011/HEALTH/01/05/autism.vaccines/index.html https://www.coasttocoastam.com/show/2018/02/21 nocompulsoryvaccination.com/2014/08/22/vaccine-autism-cover-up/ https://www.newswars.com/vaccine-autism-questioned-by-doctor-congressman-elect/ vaxtruth.org/2011/08/vaccines-do-not-cause-autism/
Neutral stance on vaccines
https://www.physicsforums.com/threads/vaccine-and-autism-link.880852/ www.discovermagazine.com/2009/jun/06-why-does-vaccine-autism-controversy-live-on https://www.ecso.org/news/autism-charity-founder-anti-vaccination-campaigner/ https://www.theguardian.com/society/2019/jun/01/professor-who-links-vaccines-to-autism-funded-through-university-portal https://www.independent.co.uk/news/world/americas/trump-vaccines-autism-links-anti-vaxxer-us-president-false-vaccine-a8331836.html https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2376879/