About the Authors

David P Wilson

To whom correspondence should be addressed. E-mail: sblower@mednet.ucla.edu (SMB), E-mail: dp.wilson@unsw.edu.au (DPW)

Affiliation University of New South Wales, Sydney, New South Wales, Australia

Sally M Blower

To whom correspondence should be addressed. E-mail: sblower@mednet.ucla.edu (SMB), E-mail: dp.wilson@unsw.edu.au (DPW)

Affiliation University of California Los Angeles, Los Angeles, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.