From what my doctor told me, the third stage trials were done by Kaiser Permanente. I imagine other agencies also participated in the studies. Why would I care who did them? I have commented how the clinical trials were conducted in an earlier post. I am too lazy to pull that post out and bore you with the same information you can easily get. I remember that the dosage study was in the stage 1 clinical trials. I think they were continued in some of the later stages, but I am not sure or if they needed to. The dosage is being given at .3 milliliters.
Paper is sourced. Results from Large Trials expected mid 2021 aka now yet they've been injecting people with this stuff for months now. Thank you for your participation in the trials. Maybe the odds be forever in your favor.
http://www.uphs.upenn.edu/cep/COVID/mRNA%20vaccine%20review%20final.pdf