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: Referral occurred at any stage of the patients ' EECU admission .
Example Output: not found

Example Input: Three hundred sixty-five patients were enrolled .
Example Output: not found

Example Input: A standard general anaesthetic technique was employed throughout .
Example Output:
not found