1.) It is possible in practice to do two different specializations, given that they stem from internal medicine. I've heard that sometimes rheum and allergy/immuno are combined. In other words, would it be possible to do heme/onc and ID, for example? How are multiple fellowships looked upon in academic medicine? 2.) The combined IM/Peds residency, how well does it train MD/PhDs interested in research and some clinical work? How is it looked upon by fellowships and beyond? Do top IM/peds programs allow for this (e.g. MGH and Boston Children's, etc.)? 3.) Do fellows almost always stay at the same institution for a tenure track position, or is it reasonably possible to switch institutions for a first faculty position, particularly to the one where med school/residency was done?