- Correspondence to Dr David S Timberlake, Program in Public Health, University of California, Irvine, Anteater Instruction & Research Building, 2nd Floor, Room 2044, Irvine, CA, USA;
- Received October 6, 2016
- Revised May 25, 2017
- Accepted May 26, 2017
- First published June 20, 2017.
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