for example we hear allergy/immuno is most competitive in internal med, but what would make that applicant better than say someone applying for endocrinology or nephrology? when we say fellowships are competitive, what does that mean? it seems from the match rates that endo, nephrology, cards, gi and a/i as well as other im fellowships all match at around 70-80% so how do you know that cards/gi/allergy are most competitive?