Correction to: NPG Asia Materials https://doi.org/10.1038/s41427-018-0040-7, published online 01 May 2018

In the version of this Article originally published, we have identified a mistake in Figure 5d, where the images of two groups were the same. We deeply apologize for this oversight. After careful review, we confirm that this error does not impact the conclusion of this study. Therefore, we want to replace the incorrect images with the correct ones provided below without making any changes to the text.

The authors apologize for any inconvenience caused.

Fig. 5

The original article has been corrected.