There are a few 6 year programs (i.e. 1 additional year of research). I am aware of St. Louis and San Diego. Other programs (OSU, HJD, Penn) have a few 6 year spots in addition to their normal 5 year spots.

Cleveland Clinic is also 6 years, with a year of research. Two residents a year do an extra research year at Case Western.

Ohio state matches 1 person per year (of the 4 total incoming residents per year) to do a 6 year program with the year of research occuring after the 3rd year.

I haven't done a search to see if it has been done, but perhaps we could post a list of all programs that are 6 years, and programs that are 5 years with a 6 year option.

University of North Carolina matches 1/4 residents into a 6 year research slot.

University of Missouri-Columbia matches 1/3 residents into a 6 year slot.

Wake Forest matches 1 resident/yr to a 7yr spot with the 2 research years at the beginning. Don't know if they would consider combining a PhD but you could call and ask.

UVa matches 1 into the 6 year track every year

Does anyone know anything about Dartmouth's program?