19581
Other covariates ( eg , presence of neutralizing antitocilizumab antibodies ) did not demonstrate a clinically meaningful effect on tocilizumab DAS28 dose - response relationships .
 None
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