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]: Multicenter , randomized , controlled , two arm-parallel , clinical trial .
[EX A]: not found

[EX Q]: Heart rate , blood pressure , and lipid measures were taken at rest , during a videotaped speech task , and during recovery from the task .
[EX A]: not found

[EX Q]: However , this approach can not account for potential third variables between participants that may affect both smoking and depression .
[EX A]:
not found