TASK DEFINITION: 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.
PROBLEM: Assessment of acute bronchodilator effects from specific airway resistance changes in stable COPD patients .

SOLUTION: not found

PROBLEM: This was a randomised non-inferiority trial carried out in a school-based clinic in New Zealand .

SOLUTION: not found

PROBLEM: Their average age was 45 years , 91 % were male , 58 % were white , 40 % served in Iraq or Afghanistan , and 42 % served in Vietnam .

SOLUTION:
average age was 45 years, 91 % were male, 58 % were white, 40 % served in Iraq or Afghanistan, 42 % served in Vietnam