1. Centers for Disease Control and Prevention/Division of Oral Health, 4770 Buford Highway, MSF10, Chamblee, GA 30341, USA;
2. Defense Resources Management Institute, Naval Postgraduate School, 699 Dyer Road, Monterey, CA 93943, USA; and
3. H. Milton Stewart School of Industrial and Systems Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0205, USA;