Nature Communications 7: Article number: 11311 (2016); Published: 18 April 2016; Updated: 3 June 2016

The author Yueh-Hsiung Kuo was incorrectly omitted from the list of corresponding authors in this Article. The correct information for correspondence is: ‘Correspondence and requests for materials should be addressed to Y.-H.K. kuoyh@mail.cmu.edu.tw) or to N.S.Y. nsyang@gate.sinica.edu.tw)’.