Adverse drug reactions are appreciably harmful or unpleasant reactions resulting from an intervention related to the use of medical products, which predicts hazard from future administration and warrants prevention or specific treatment, or alteration of the dosage regimen, or withdrawal of the product. Given medical case reports extracted from MEDLINE, the task is to classify whether the case report mentions the presence of any adverse drug reaction. Classify your answers into non-adverse drug event and adverse drug event.

Example Input: PURPOSE: Symptomatic visual field constriction thought to be associated with vigabatrin has been reported.
Example Output: adverse drug event

Example Input: At postmortem examination, the characteristic microvascular lesions of the hemolytic-uremic syndrome were found in the kidneys.
Example Output: non-adverse drug event

Example Input: PURPOSE: To describe a case of progressive outer retinal necrosis in a human immunodeficiency virus-negative immunosuppressed patient undergoing treatment for graft-versus-host disease after bone marrow transplantation.
Example Output:
non-adverse drug event