- Correspondence to Dr Sharon Cummins, Department of Family and Preventive Medicine, University of California, San Diego, 9500 Gilman Drive, MC 0905, La Jolla, CA 92093-0905, USA;
- Received December 19, 2013
- Revised March 11, 2014
- Accepted March 13, 2014
- First published May 12, 2014.
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