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 Q]: No change was evident in group 2 .
[EX A]: not found

[EX Q]: Further studies will incorporate individualized dosing based on pretreatment acetylator phenotyping .
[EX A]: not found

[EX Q]: 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 .
[EX A]:
not found