Q: 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.
Transfer factor of the lung for carbon monoxide ( TLCO ) was measured by a new method based on analysis of the ratio of the concentrations of carbon monoxide to an inert gas ( methane ) relative to lung volume during a constant exhalation .
A:
not found