- Correspondence to Dr Maria Elena Martinez, Department of Family Medicine & Public Health, Moores Cancer Center, University of California San Diego, 3855 Health Sciences Drive, #0901, La Jolla CA 92093-0901, USA;
- Received June 22, 2015
- Revised November 4, 2015
- Accepted November 5, 2015
- First published December 11, 2015.
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