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]: Serum and urine biochemical parameters related to calcium status and bone metabolism remained unaltered .
[A]: not found


[Q]: To estimate cost and outcomes of the Arthritis Foundation aquatic exercise classes from the societal perspective .
[A]: aquatic exercise


[Q]: In the men taking regular exercise serum cholesterol concentrations increased 26 % more in the high density lipoprotein subfraction two ( HDL2 ) and decreased 31 % more in the subfraction three ( HDL3 ) and 9 % more in the low density lipoprotein fraction than in the control group .
[A]:
not found