- Correspondence to Professor Beate Ritz, Department of Epidemiology, Fielding School of Public Health, University of California, Los Angeles (UCLA), Box 951772, Los Angeles, CA 90095-1772, USA;
- Received March 20, 2013
- Revised October 9, 2013
- Accepted December 10, 2013
- First published January 16, 2014.
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