1. Centers for Medicare & Medicaid Services https://www.cms.gov/Research-Statistics-Data-and-Systems/Statistics-Trends-and-Reports/NationalHealthExpendData/Downloads/Proj2012.pdf 2015
2. Centers for Medicare & Medicaid Services https://www.cms.gov/apps/physician-fee-schedule/search/search-criteria.aspx 2015
3. Centers for Medicare & Medicaid Services https://www.cms.gov/Medicare/Medicare-Fee-for-Service-Payment/HospitalOutpatientPPS/Hospital-Outpatient-Regulations-and-Notices-Items/CMS-1613-P.html 2016
4. Patient perception of physician reimbursement for common hand surgical procedures;Fowler;Orthopedics,2013
5. Patient perceptions of physician reimbursement for spine surgery;Badlani;Spine (Phila PA 1976),2013