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]: There was no difference in the proportion of patients requiring transfusions during the study ( 23 % in 40K arm and 18 % in 120K arm , P = .22 ) or specifically during the maintenance phase ( 13 % in 40K arm v 15 % in 120K arm , P = .58 ) .
[EX A]: not found

[EX Q]: Regression analyses estimated the association between ASD diagnosis and cost , controlling for child gender , age , race/ethnicity , insurance status , household income , country region and urban/rural classification , and non-ASD-related illnesses .
[EX A]: not found

[EX Q]: All participants received usual care .
[EX A]:
not found