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.

[Q]: Limitations and suggestions for future research are discussed .
[A]: not found


[Q]: 21 patients ( age 0-2 months ) and 40 healthy infants ( age 0-2 months ) were investigated .
[A]: not found


[Q]: When response was analyzed by hematological toxicity , there was a 35.7 % response if patients had leukopenia grade 3/4 ( versus 8.3 % , P = 0.08 ) .
[A]:
not found