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.

Q: The results confirm the importance of psychological factors in early RA and their relative independence from physical findings .

A: not found
****
Q: The origin of the gastric phasic activity patterns is unknown , but they may be related to electrical control activity .

A: not found
****
Q: One case of unsubstantiated acute rheumatic fever occurred after 7 days of amoxicillin .

A:
not found
****