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: Factors with a P value of < or =0.25 within a cycle were included in a generalized estimating equations regression model .

SOLUTION: not found

PROBLEM: Gastrointestinal symptoms have been reported in association with myoelectrical dysrhythmia , where different types of gastric electrical activity have been described .

SOLUTION: not found

PROBLEM: The purpose of this study was to examine the effect of chronic cigarette smoking , acute nicotine administration , and OC use on cardiovascular and lipid reactivity .

SOLUTION:
not found