- Correspondence to Dr Brandie DePaoli Taylor, Department of Epidemiology and Biostatistics, School of Public Health, Texas A&M Health Science Center, 211 SRPH Administration Building, TAMU 1266, College Station, TX 77843-1877, USA;
- Received January 13, 2014
- Revised April 17, 2014
- Accepted May 4, 2014
- First published May 21, 2014.
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