Unlike the three-year residency programs that doctors must generally complete after medical school in order to practice medicine, nurse practitioner residency programs, sometimes called fellowships, are completely voluntary. Antenna/fStop/Getty Images hide caption
residency residency
Stories About
residency
Dr. Katie Merriam, an OB-GYN resident in Charlotte, N.C., says she loves her mostly female work environment but also appreciates having male colleagues. Alex Olgin/WFAE hide caption