Original sentence: According to a FactCheck review, Campbell had in his video drawn attention to the poor quality of the research on which these claims were based, pointing to typos in the abstract, poor methodology, and a lack of clear data.Campbell said he was not sure about the claim or its quality, but did not mention the expression of concern that had been published for the abstract, saying instead that it could be "incredibly significant".Further, Kall said that there was no evidence of ivermectin being used in large numbers in Japan; rather, she said it "appears this was based on anecdata on social media driving wildly damaging misinformation".However, the drug had never been officially authorised for such use in the countryits use was merely promoted by the chair of a non-governmental medical association in Tokyo, and it has no established benefit as a COVID-19 treatment.In November 2021, Campbell quoted from a non-peer-reviewed journal abstract by Steven Gundry saying that mRNA vaccines might cause heart problems.The video was viewed over 2 million times within a few weeks and was used by anti-vaccination activists as support for the misinformation that COVID-19 vaccination will cause a wave of heart attacks
Edited sentence: Also in November 2021, Campbell quoted from a non-peer-reviewed journal abstract by Steven Gundry saying that mRNA vaccines might cause heart problems.Campbell expressed concerns regarding the quality of the abstract.The video was used by anti-vaccination activists to support further anti-vaccine misinformation