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.

In this adequately powered study , once-daily oral amoxicillin is not inferior to twice-daily penicillin V for the treatment and eradication of GABHS in children with pharyngitis .
children with pharyngitis

In contrast , the number of wet nights and urodynamic parameters did not change significantly in group 2 .
not found

Previous analyses that focused on health care underestimated this economic burden , particularly for school systems .

not found