In the 1960s, due to a national shortage of physicians and government incentives for schools that increased their class sizes, Dartmouth Medical School graduates began to experience difficulty in trying to transfer to other medical schools to complete their final two years of medical school as other medical schools had increased their class size and could not accommodate transfer students. In the meantime, Mary Hitchcock Memorial Hospital had grown to be a 400-bed medical center, and Dartmouth Medical School had established a partnership with a 224-bed Veterans Administration Hospital in White River Junction, Vermont. The Doctor of Medicine program, now possible with the expanded local medical centers, was reinstated by a vote of the trustees in 1968. The admission of M.D. candidates resumed in 1970. Initially, the medical school curriculum was three years in length, unlike most medical schools, but it later was increased to the usual four years in 1979.