- Correspondence to Thomas W Largo, Bureau of Disease Control, Prevention, and Epidemiology, Michigan Department of Community Health, 201 Townsend St, PO Box 30195, Lansing, MI 48909, USA;
- Received May 22, 2014
- Revised September 18, 2014
- Accepted October 27, 2014
- First published November 12, 2014.
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