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Children participating in BraMat , a sub - cohort of the Norwegian Mother and Child Cohort Study ( MoBa ) , were followed in the three first years of life using annual questionnaires ( 0 - 3years ; n = 162 , 2 - 3years ; n = 180 ) , and blood parameters were examined at three years of age ( n = 114 ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None