TASK DEFINITION: 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.
PROBLEM: Oral contraceptive use is associated with increased cardiovascular reactivity in nonsmokers .

SOLUTION: not found

PROBLEM: Aquatic exercisers reported equal ( QWB ) or better ( CHDR , HAQ , PQOL ) health-related quality of life compared with controls .

SOLUTION: not found

PROBLEM: The effects of the high intake of Maillard reaction products ( MRP ) on calcium availability in adolescents and across Caco-2 cell monolayers were examined .

SOLUTION:
adolescents