**Author details**

Molly Pui Man Wong<sup>1</sup> and Ray Kit Ng<sup>2</sup> \*

\*Address all correspondence to: raykitng@hku.hk

1 School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China

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DOI: 10.1073/pnas.0900687106

2 School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China
