Study examines counts, retained items.
D005547:Foreign Bodies / Q000517:prevention & control*; D006302:Health Services Research; D006801:Humans; D019300:Medical Errors / Q000517:prevention & control*; D009519:New York City; D009873:Operating Rooms / Q000592:standards*; D019990:Perioperative Care / Q000592:standards*; D017751:Safety Management / Q000379:methods*; D013525:Surgical Instruments; D013597:Systems Analysis