NVIC is the oldest and largest parent-led organization advocating reform of mass vaccination programs.
Notice that it's 'parent-led', not physician- or scientist-led. These are the same people who passionately believe that autism is caused by vaccinations. I'd suggest checking with the CDC and the FDA before believing anything that comes from a crackpot fringe group. I consulted a PharmD and an OB/GYN about this and was soundly chastised for even suggesting that the NVIC was a reliable source of scientific information.
Every part that isn't backed up by a reproducible, statistically significant scientific study published in a respectable journal. So, pretty much all of it.