American College of Physicians/Annals of Internal Medicine
The American College of Physicians is the largest medical specialty organization and second-largest physician group in the United States, whose goal is to enhance the quality and effectiveness of health care by fostering excellence and professionalism in the practice of medicine. Its membership of 154,000 includes internists, subspecialists, residents, fellows, and medical students.
Annals of Internal Medicine is among the most highly cited and influential journals in the world. The most recent (2017) Impact Factor for Annals of Internal Medicine is 19.384 (Clarivate Analytics), with 53,689 total cites in 2017.
Since 1967, Medical Knowledge Self-Assessment Program (MKSAP) has been trusted by physicians to assess their knowledge in internal medicine and the subspecialties.