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: We conclude that oral methotrexate did not slow down progression of muscle weakness but decreased serum creatine kinase activity .
Example Output: not found

Example Input: Prior adjuvant chemotherapy was permitted .
Example Output: not found

Example Input: Of the group 2 patients 64 % preferred 2 weeks of stenting .
Example Output:
not found