The M.B. or Bachelor of Medicine was the first medical degree to be granted in the United States and Canada. The first medical schools that granted the M.B. degree were at the University of Pennsylvania and Columbia University. Columbia University was the first American university to grant the M.D. degree in 1770, although, as in England, this followed the M.B. (which was the qualifying degree) and required completion of a thesis. Professional societies started licensing doctors from the 1760s, and in the early nineteenth century started setting up their own medical schools, known as proprietary medical colleges, the first being the medical college of the Medical Society of the County of New York, which opened March 12, 1807. These eliminated the general education and long lecture terms of the university schools, making them much more popular. Without effective regulation, abuses arose, and national conventions in 1846 and 1847 led to the establishment of the American Medical Association. This new body set the first nationwide standards for M.D. degrees, requiring that students had a liberal education in arts and sciences as part of their degree, that they had served an apprenticeship before starting the course, and that the course lasted three years.