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: Followup was done with diuretic scanning at 3 , 6 , 9 and 12 months and then yearly , and thereafter with diuretic renography .
Example Output: not found

Example Input: Accordingly , the current study examined within-person covariation between time-varying abstinence and depressive symptom in a multilevel model ( MLM ) , which allowed for transitions between smoking statuses within a participant .
Example Output: not found

Example Input: [ The effect of ionic and nonionic x-ray contrast media on myocardial perfusion and myocardial function ] .
Example Output:
ionic, nonionic