- Correspondence to Professor Wilfried Karmaus, Division of Epidemiology, Biostatistics, and Environmental Health, School of Public Health, University of Memphis, 301 Robison Hall, Memphis, TN 38152, USA;
- Received January 5, 2014
- Revised May 14, 2014
- Accepted May 15, 2014
- First published June 3, 2014.
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