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.

Input: Consider Input: Results indicated that , among OC nonusers , there was no effect of smoking status or nicotine administration on cardiovascular reactivity .

Output: OC nonusers


Input: Consider Input: Its toxicity has previously been correlated to the formation of an active metabolite , N-acetyl-amonafide .

Output: not found


Input: Consider Input: The end point of CALGB 8642 is to assess the difference in survival , toxicity , and overall response when limited exposure to Phase II agents precedes standard chemotherapy .


Output: not found