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.

Trials involving larger patient populations will be necessary to confirm the results of this preliminary study and to determine the extent of clinical improvement , subpopulations benefited , role in heart failure therapeutics , and so forth .
not found

These results are not concordant with the view that intentional smoking abstinence exacerbates depressive symptoms .
not found

This is the first study to document the importance of illness perceptions in recent onset RA .

not found