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 .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None