In 1847, two-hundred medical societies and by then 28 Colleges of Medicine came together and formed the American Medical Association (AMA). It established a uniformed medical college admission policy. This included a liberal education in arts and sciences, and a certificate of apprenticeship completion. By 1852, an MD degree required 3-years of study (including 3 months of dissection) and 2-years of internship under an acceptable practitioner. Also, graduates had to be at least 21-years old.