Clinical Center training
You can do up to 12 weeks are non-sgu affiliates. I did at mt sinai in nyc. HOWEVER- and this is a BIG one: some states will not count that as credit to your md degree; that is even if you go to mass general, since its not an sgu affiliate they will not give you credit for the weeks you spend there. So what? So you may not be able to do a residency or get a license in those states.
Remember always that if you were in school in the us you'd be lilkely be limited to a smal area for rotations at one or a couple of hospitals. You would be able to do outside rotations more easily, but always the bulk is done "at home".
If you get a warning, put on yer manpants and stop whining about it.