instruction:
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.
question:
Intake of lime juice was recently demonstrated to facilitate clearance of the malaria parasite .
answer:
not found


question:
573 patients who had unrecognized and untreated anxiety identified from the approximately 8,000 patients who completed the waiting room screening questionnaire .
answer:
8,000 patients, waiting room screening questionnaire


question:
Effects of mild physical exercise on serum lipoproteins and metabolites of arachidonic acid : a controlled randomised trial in middle aged men .
answer:

middle aged men


