Specialization, subspecialization, and subsubspecialization in internal medicine.

Cassel CK, Reuben DB. Specialization, subspecialization, and subsubspecialization in internal medicine. N Engl J Med. 2011 Mar 24; 364(12):1169-73.

2011
https://researcherprofiles.org/profile/7172669
21428774

Cassel CK, Reuben DB