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.

Ex Input:
Development of renal disease in people at high cardiovascular risk : results of the HOPE randomized study .

Ex Output:
people at high cardiovascular risk


Ex Input:
MLMs indicated a slight increase in depressive symptoms over time in the sample as a whole .

Ex Output:
not found


Ex Input:
The study was a two-arm , parallel randomized clinical trial .

Ex Output:

not found