Fear and Loathing in Mos Eisley
Caduceus Galactic is the largest health organization in the known galaxy. As far as anyone can tell they were around at least as far back as the Old Republic and it is widely believed they were founded shortly after the advent of hyperdrive as diseases from all over the galaxy began to make their way to planets and populations creating epidemics not seen in hundreds of years.
Caduceus Galactic is said to have been established by a coalition of Jedi Healers and doctors who went around to plague ridden planets and combined their Force powers and knowledge saving entire races that would have very likely died off without their intervention.
Thus far Caduceus Galactic has been able to weather the transition from the Old Republic to the Empire, but their stance on helping all life, not just human life has opened them up to scrutiny from Imperial forces.