i'm planning to do IM. I'm planning to start 4th year off w/ 2 medicine sub-i's and have a choice of a bunch of different kinds. Should I do a general one and micu, or does it not matter? I was thinking about cardio sub-i since it's a little more focused and perhaps easier to know more well than general sub-i since i did a month of cardio for 3rd year rotations.