Often repeated, but the data doesn't bear it out, especially in aggregate.
https://www.raps.org/getattachment/5578195e-ed51-4f03-8adc-c...
https://www.raps.org/news-and-articles/news-articles/2019/7/...
https://www.raps.org/news-and-articles/news-articles/2019/7/...