18408
Additional studies are underway investigating the safety and efficacy of cobicistat - boosted protease inhibitor regimens for both treatment - na i ve and treatment - experienced patients .
 Chemical: cobicistat
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: cobicistat