instruction:
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.
question:
Although an increasing number of group-based programs for the improvement of social skills have been described , randomized controlled trials are needed to evaluate their efficacy .
answer:
not found


question:
Comparisons with the cyclophosphamide-doxorubicin-5-fluorouracil arm will not be addressed .
answer:
not found


question:
We randomly assigned 28 patients with refractory monosymptomatic nocturnal enuresis to 2 equal groups .
answer:

28 patients with refractory monosymptomatic nocturnal enuresis