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.

No significant differences , within and between groups , were observed in the exercise-induced increase in the ratios para- and ortho-hydroxyantipyrine to antipyrine .
not found

Stent related symptoms were present in a good proportion of patients in groups 1 and 2 but there was a significant difference in the incidence of urinary tract infections ( 11.5 % versus 38.1 % , p = 0.04 ) .
not found

Role of posterior tibial nerve stimulation in the treatment of refractory monosymptomatic nocturnal enuresis : a pilot study .

refractory monosymptomatic nocturnal enuresis