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.

Example Input: After adjusting for child demographic characteristics and non-ASD-associated illnesses , ASD was associated with $ 3020 ( 95 % confidence interval [ CI ] : $ 1017- $ 4259 ) higher health care costs and $ 14,061 ( 95 % CI : $ 4390- $ 24,302 ) higher aggregate non-health care costs , including $ 8610 ( 95 % CI : $ 6595- $ 10,421 ) higher school costs .
Example Output: not found

Example Input: Patients in the experimental group received a brief note in which they were explicitly asked to increase both their physical activity level and time of sun exposure , while control group patients did not receive these explicit recommendations .
Example Output: not found

Example Input: Among the 273 children who were seen and weighed at the one-year follow-up visit , the rate of weight gain was 8 per cent greater for those receiving levamisole than for placebo-treated controls ( p = .06 ) .
Example Output:
273 children