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: Bilateral Acanthamoeba keratitis with late recurrence of the infection in a corneal graft: a case report.
Example Output: non-adverse drug event

Example Input: It should be emphasized that the recurrence of nephrotic syndrome was observed after the following chemotherapy, including M-CSF, whereas the bone marrow still remained completely remitted.
Example Output: adverse drug event

Example Input: MATERIALS AND METHODS: Two dialysis patients with recently rejected renal allografts who were hospitalized because of fever of unknown origin are reported.
Example Output:
non-adverse drug event