First, thanks so much for the advice shared @ this site, hope I can contribute soon. There is a philosophy that one could/should submit 1 ophtho letter and 2 core rotation letters. my question is: for the 2 core rotations, should one do 2 glowing letters from internal med docs; or 1 great internal letter and one good/ok, but less personal surgery letter? Thanks! ps-I think the late 4th letter deal is obsolete now, correct?