Correction to: *Scientific Reports* 10.1038/s41598-017-08831-z, published online 22 August 2017

This Article contains errors in the Results section.

"On the other hand, the width ratio of the neck to the bypass channel was optimized to 3:4 in order to favor fluid flow into the well over the bypass. In this work, three designs were tested: the widths of the neck to the bypass channel were 75 μm/100 μm, 100 μm/100 μm and 100 μm/150 μm, respectively. Results showed that the design of 75 μm/100 μm neck to bypass width favored fluid flow into the well over the bypass channel (Supplementary Movie 2)."

should read:

"On the other hand, the width ratio of the bypass to the neck channel was optimized to 3:4 in order to favor fluid flow into the well over the bypass. In this work, three designs were tested: the widths of the bypass to the neck channel were 75 μm/100 μm, 100 μm/100 μm and 100 μm/150 μm, respectively. Results showed that the design of 75 μm/100 μm bypass to neck width favored fluid flow into the well over the bypass channel (Supplementary Movie 2)."
