Harvard Pilgrim published a followup VAERS research study in 2015. It goes into a lot of detail of how doctors vastly underreport vaccine injuries to VAERS. https://pubmed.ncbi.nlm.nih.gov/26060294/ . Often times you hear that only 1% of vaccine injuries are reported to VAERS. That number comes from the old Harvard Pilgrim report, but that report isn't as detailed and formal as the new 2015 study. Check it out!
Listen to Wayne Rohde interview me on this topic! https://soundcloud.com/user-189985311/stan-gotshall-vaers-research