Scientific Reports 6: Article number: 25035; published online: 28 April 2016; updated: 10 June 2016

The Acknowledgements section in this Article is incomplete.

“Thanks very much for the contributions on statistical work by Dr Qian Zhou”.

should read:

“Thanks very much for the contributions on statistical work by Dr Qian Zhou. This work was supported by grants from the National Natural Science Foundation of China (Grant 81370786)”.