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Source for bariatric surgery, women's health, and maternity care: Individual states ( AZ, CA, FL, IA, MA, MD, ME, NJ, NV, NY, OR, PA, TX, UT, VA, WA, and WI ) for years 2004 - 2006.
Source for all other procedures: Centers for Medicare and Medicaid Services for years 2004 - 2006.