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.

[EX Q]: The latter metabolite is not formed in man through the mono-oxygenase pathway of cytochrome P450 .
[EX A]: not found

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

[EX Q]: A 3 day balance was performed at the end of each period , and fasting blood samples were collected .
[EX A]:
not found