Wonder how just for talking purposes, a "reverse" mission trip would work?
Say a few Belezian doctors and teenage volunteers etc (hope spelling is correct) decide to go to say Detroit, or better, N Y City (it has tourist sites,) and conduct a free 4 day clinic on say 123 street. Wonder what the reaction would be?

Would they be asked about their credentials and would they need to have a (US issued or recognized) license to practice medicine? Would the health department be concerned about how their infection control is done?