- Correspondence to Dr Phillip A Gribble, Charles Wethington, Jr. Building, Room 206C, 900 South Limestone, College of Health Sciences, University of Kentucky, Lexington, KY 40536-0200, USA;
- Accepted 12 May 2016
- Published in print 1 December 2016.
- Published online 28 November 2016.
- Published first 3 June 2016.
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