if you go to FRIEDA check the program info, some programs like Emory offer a two year residency plus one year research with non-accredited fellowship track. Can anyone explain me that? and its usefulness?

http://www.abim.org/cert/respath_pp.shtm
http://mstp.uci.edu/currentstudents/residencyandresearch2.php
http://www.dpo.uab.edu/~paik/rr.html