Assertion: catecholamine's effect | /r/HasProperty | investigated by colleague
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Source sentences:
text: The effects of stress on urinary catecholamines have been investigated by Kook and colleagues who found that healthy dogs undergoing routine examinations and blood collection had significantly higher urinary epinephrine and norepinephrine : creatinine ratios on the day of examination compared with urine samples collected 7 days later.30