In medical studies, treatments are tested 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 give information about the participants of the study. You should list the phrases in the same order that they appear in the text, separated by commas. If no information about the participants is mentioned, just output "not found". Relevant information about participants include: gender, medical conditions, location, number of people participating. Do not contain participant mentions without relevant information.
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Question: In conclusion , in 60-year-old subjects antioxidant supplementation had no effect on the exercise-induced increase in oxidative stress as measured by free radical products of antipyrine .

Answer: 60-year-old subjects


Question: Comparison of weakness progression in inclusion body myositis during treatment with methotrexate or placebo .

Answer: not found


Question: Inherent stent related problems warrant a minimum possible duration of stenting without compromising the results of endopyelotomy .

Answer:
not found