TASK DEFINITION: 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.
PROBLEM: [ The effect of ionic and nonionic x-ray contrast media on myocardial perfusion and myocardial function ] .

SOLUTION: ionic, nonionic

PROBLEM: Results indicated that , among OC nonusers , there was no effect of smoking status or nicotine administration on cardiovascular reactivity .

SOLUTION: not found

PROBLEM: In addition , supplementation did not affect the exercise-induced increase in thiobarbituric acid reactive substances in plasma .

SOLUTION:
supplementation