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 Input:
Constant exhalation may therefore be a useful alternative to the breath holding technique for clinical measurement of TLCO .

Ex Output:
not found


Ex Input:
Is a 2-week duration sufficient for stenting in endopyelotomy ?

Ex Output:
not found


Ex Input:
Follow-up data suggested that treatment gains were maintained by children at 5-months post-intervention .

Ex Output:

not found