Just for clarification, AP/CP program here at Stanford involves 2 years of AP (inlcludes ample elective slots), then technically 1.5 years of CP, not 2. Third year you do CP, but your 4th year is completely flexible, requiring 6 months of more senior level type CP rotations, but can be intermingled however you want with 6 months of elective. i.e, some just grind through the additional 6 months of CP then do go back and do all AP electives, some vice versa, some go back and forth. I'm explaining this only b/c I had this fear that being away from AP for 2 years would suck. In fact it's just 1 year away, with tons of AP conference lectures and microscope sessions to keep you in the loop. Plus you get 6 months of totally flexible elective time, to be used for AP/CP/research/etc (many residents even make up their own electives, i.e. liver, kidney, etc.).