Zirui Song Bruce E. Landon The American Journal of Managed Care October 1, 2018 2018 Michael L. Barnett, MD, MS; Zirui Song, MD, PhD; Asaf Bitton, MD, MPH; Sherri Rose, PhD; and Bruce E. Landon, MD, MBA, MSc https://www.ajmc.com/journals/issue/2018/2018-vol24-n10/gatekeeping-and-patterns-of-outpatient-care-post-healthcare-reform?p=1
