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.

[Q]: Cardiovascular reactivity to psychological stress may be one mechanism for the enhanced risk , but the small number of studies examining whether OC users who smoke have greater reactivity have produced mixed results .
[A]: not found


[Q]: Eighteen patients who had undergone stoma surgery were assessed with respect to their anxiety level and self-reported quality of life ( QoL ) on three occasions ; namely , immediately after surgery , 5 weeks after surgery , and 10 weeks after surgery .
[A]: not found


[Q]: Amonafide is a new imide derivative of naphthalic acid .
[A]:
not found