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.

Example Input: Significant differences in terms of ΔITGV ( p=0.002 ) , ΔRV ( p=0.023 ) , and ΔVAS ( p < 0.001 ) occurred only if patients were stratified according to ΔsRAW .
Example Output: not found

Example Input: Antioxidant supplementation and exercise-induced oxidative stress in the 60-year-old as measured by antipyrine hydroxylates .
Example Output: 60-year-old

Example Input: Since the results were essentially identical between the techniques , it seems that comparable pathophysiological factors affect TLCO during breath holding and constant exhalation .
Example Output:
not found