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We investigated the diurnal rhythm of the HPA axis in infants with CHD by measuring salivary cortisol in the morning ( 0600 - 0900 h - circadian peak ) and evening ( 2100 - 2400 h - circadian nadir ) .
 Chemical: cortisol
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: cortisol