like sree said, fellowship attainment is more dependent on where you go for residency (and what you do there).
while it possible to get fellowships from a residency program that doesn't have your specific fellowship, your chances are greatly improved if your residency program has Allergy or Hem/Onc (either uni or community)- there will be people in the field who know other PDs and there will be research going on in the field as well.
Endocrinology, Diabetes and Metabolism Attending
ABIM certified IM
ValueMD-the place "where nothing makes sense, but everything is related-fellow vmd'r gabon