20348
Innovative study methods , including opportunistic sampling and sensitive analytical assays used in combination with physiologically based pharmacokinetics , and population pharmacokinetic model concepts may help to improve our understanding of the ontogeny of CYP3A and aid the application of this knowledge in clinical practice .
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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