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.

Example Input: The drug is extensively metabolized and detected in plasma and urine .
Example Output: not found

Example Input: No clinically serious adverse events were observed in any of the groups .
Example Output: not found

Example Input: Bestatin is shown to be a clinically useful drug for immunotherapy of adult ANLL , since it has prolonged survival and remission especially in elderly patients , with few side-effects .
Example Output:
not found