In the control group , serum concentrations after vehicle administration were below LLOQ ( 15 pg / mL ) in all but 2 samples .
In the control group , serum concentrations after vehicle administration were below LLOQ ( 15 pg / mL ) in all but 2 samples .
O O B-GROUP I-GROUP O O O O O O O O O O O O O O O O O O O O O