The Geisel School of Medicine offers the four-year Doctor of Medicine (M.D.) degree and the Doctor of Philosophy (PhD) degree in certain fields. In addition, the school offers two joint-degree programs: the combination M.D./Ph.D., for which the Ph.D. can be obtained from any doctoral program at Dartmouth, and the combination MD/MBA, offered in conjunction with the Tuck School of Business. The Dartmouth Institute for Health Policy and Clinical Practice, one of a number of DMS research institutes, offers its own degree programs in evaluative clinical sciences, including a Master of Public Health (MPH), a Master of Science (M.S.), a PhD, post-doctoral fellowships, several joint-degree programs, and a residency program for preventive medicine. Mary Hitchcock Memorial Hospital also offers residencies and fellowships which are administered by Dartmouth Medical School faculty.