What's the market for outpatient surgery?
D000556:Ambulatory Surgical Procedures / Q000706:statistics & numerical data; D003258:Consumer Behavior; D008389:Marketing of Health Services; D010044:Outpatient Clinics, Hospital / Q000706:statistics & numerical data*; D013531:Surgicenters / Q000706:statistics & numerical data*; D014481:United States