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: Changes in symptomatology , exercise performance , and left ventricular function were assessed serially during the two-month treatment period .
Example Output: not found

Example Input: The patients suffered from partial or total intestinal obstruction , necrotizing enterocolitis or pyloric stenosis.All infants were fasting and studied during periods of at least one hour .
Example Output: partial or total intestinal obstruction , necrotizing enterocolitis or pyloric stenosis.All infants

Example Input: This study was conducted to determine the long-term effect of flosequinan , a new orally administered arterial and venous dilator , on the clinical course of patients with moderate to severe congestive heart failure .
Example Output:
patients with moderate to severe congestive heart failure