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 Q]: Patients under each drug condition were compared with controls to assess normalization effects .
[EX A]: not found

[EX Q]: Eligible patients were randomly assigned at enrollment to receive three weekly doses of epoetin alfa 40,000 U subcutaneously ( SC ) , followed by either standard weekly epoetin alfa ( 40K arm ) or 120,000 U of epoetin alfa ( 120K arm ) SC every 3 weeks for 18 additional weeks .
[EX A]: not found

[EX Q]: Social skills improvement in children with high-functioning autism : a pilot randomized controlled trial .
[EX A]:
children with high-functioning autism