14229
OBJECTIVES : To develop population pharmacokinetic ( PK ) models for piperacillin / tazobactam in neonates and infants of less than 2 months of age in order to determine the appropriate dosing regimen and provide a rational basis for the development of preliminary dosing guidelines suitable for this population .
 Chemical: piperacillin; Chemical: tazobactam
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: piperacillin; Chemical: tazobactam