In medical studies, the efficacy of medical treatments (called interventions) is evaluated within a group of study participants. You will be given a sentence of a study report in which your task is to list the phrases that describe the intervention(s) of the study. You should list the phrase in the same order that they appear in the text, separated by commas. If no information about the interventions is mentioned, just answer with "not found". Interventions are: a specific drug, surgery, talking therapy, a lifestyle modification, control or placebo treatment. Do not include details, dosages, frequency and duration, intervention mentions that are not in an informative span of text.

Example Input: Its toxicity has previously been correlated to the formation of an active metabolite , N-acetyl-amonafide .
Example Output: not found

Example Input: The end point of CALGB 8642 is to assess the difference in survival , toxicity , and overall response when limited exposure to Phase II agents precedes standard chemotherapy .
Example Output: not found

Example Input: After three weekly doses of epoetin alfa 40,000 U , a dose of 120,000 U can be administered safely once every 3 weeks without increasing transfusion needs or sacrificing QOL .
Example Output:
epoetin alfa