I too have been looking around: it seems that the trend everywhere is going to 7 years, which just seems painful, especially considering the call, etc.
Searching through the websites of places in the midwest, I have found these that are still 6 years, though one wonders how long it would last: U of Illinois at Peoria, Vanderbilt, U of Virginia, U of Chicago. The following are all 7: U Minnesota, Mayo, U Cincinnati, Case Western, Cleveland Clinic, Ohio State, U Wisc, Medical College Wisconsin, U Michigan.
Does anyone know why it is moving to 7 years, seemingly everywhere?