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.

Economic evaluation of aquatic exercise for persons with osteoarthritis .
aquatic exercise

Depression , functioning , perceived quality of care , utilization , and costs were secondary outcomes .
not found

Group 1 received a weekly session of posterior tibial nerve stimulation for 12 weeks and group 2 was the placebo group .

posterior tibial nerve stimulation, placebo