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: These 22 patients constituted the control group of a controlled trial and received standard outpatient clinic treatment during follow-up .
Example Output: 22 patients

Example Input: Lack of blinding as a result of different treatment schedules may have confounded results .
Example Output: not found

Example Input: There may be a steep dose-response curve , based on the significant correlation between myelosuppression and response .
Example Output:
not found