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: Studies in animals show good healing after 1 to 2 weeks of ureterotomy .

A: animals
****
Q: The pain in sickle cell anemia ( SCA ) is often triggered by dehydration , acidosis , and fever that are usually due to malaria .

A: not found
****
Q: Outcomes improved with regular class attendance .

A:
not found
****