The American College of Physicians (ACP) is a national organization of internists, who specialize in the diagnosis, treatment, and care of adults. With 161,000 members, ACP is the largest medical-specialty organization and second-largest physician group in the United States, after the American Medical Association. Its flagship journal, the Annals of Internal Medicine, is considered one of the five top medical journals in the United States and Britain. Mission and history Founded in 1915, ACP's stated mission is to "enhance the quality and effectiveness of health care by fostering excellence and professionalism in the practice of medicine." In 1998, it merged with the American Society of Internal Medicine (ASIM). ASIM's focus on the economic, political, and social aspects of medical care both enlarged and complemented its mission. Known as ACP-ASIM from 1998 to 2003, the organization re-adopted "American College of Physicians" as its corporate name from 2003 on. Structure The college is governed by a board of regents, the main policy-making body that oversees its business and affairs. The board of regents is made up of elected officers. The board of governors serves as an advisory board to the board of regents, along with a various councils and committees. The board of governors is composed of elected governors who implement projects and initiatives at a chapter level and represent member concerns at the national level. The board of governors is composed of elected governors in chapters and regions of the United States, Canada, Central and South America, Japan, and Saudi Arabia. The organization is represented in the American Medical Association, the Council of Medical Specialty Societies, and other associations. Membership and recognition Levels of membership are Medical Student, Associate, Member, Fellow (FACP), and Master (MACP). Fellowship and Mastership in ACP recognize outstanding achievement in internal medicine. Fellows are recommended by their peers, endorsed by their local chapter leadership, and reviewed by a national credentials subcommittee. Masters are nominated from among the Fellows of ACP for annual election to this group. Board certification in internal medicine is not required, though potential members must be "board eligible." Non-Physician Affiliate membership is available to licensed non-physician health care professionals, or a physician holding an internationally equivalent degree and who maintain their professional credentials to practice. Publications and products The American College of Physicians distributes numerous publications and products to members. They include: Annals of Internal Medicine, the weekly peer-reviewed medical journal, in print twice