As a general rule, most MSTP programs do not want to hear that you are not interested in science, hard science. It is, after all, a medical scientist training program. That being said, there are a few that will let you do a phd in social sciences. You can knock most schools off the list simply by where the med school is in relation to the graduate school. Einstein, NYU, Cornell, Sinai, UCSF and many others either have no non-science graduate school to speak of, or, are geographically displaced from the graduate school, precluding any possibility of doing a phd in social sciences. True, some schools will collaborate to let you do the long distance thing, but from what I have seen they like to keep you close, and discourage it. The classic ivies and some others are your best bet. Places like Harvard, Columbia, Yale, etc. are going to be more open to non-traditional proposals, and have the facilities close at hand for you to persue it.