Table?1 Imperfect studies evaluating N-acetylcysteine which are at present signed up about the clinicaltrials.gov registry Field Pathology Country Number of patients; details on the design Amount in clinicaltrials.gov Nephrology Angiographic procedures in high-risk individuals USA 8,680 NCT01467466 Contrast nephropathy Iran 549 NCT01820195 Israel 70 NCT01564303 Diabetic nephropathy United states o