1 LaKind Associates, LLC, 106 Oakdale Avenue, Catonsville, Maryland 21228 USA; Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
2 Burns Epidemiology Consulting, LLC, 255 W. Sunset Ct., Sanford, MI 48657, USA.
3 Arnold School of Public Health, Department of Biostatistics and Epidemiology University of South Carolina, 921 Assembly Street, Columbia, SC 29208, USA.