1. Division of Infectious Disease Epidemiology, Pennsylvania Department of Health, Harrisburg.
2. Clinical Epidemiology and Biostatistics, University of Pennsylvania School of Medicine, Philadelphia.
3. Division of Communicable Disease Surveillance, Maryland Department of Health and Mental Hygiene, Baltimore.
4. New Jersey Department of Health and Senior Services, Trenton.
5. Division of Biostatistics, Department of Health Evaluation Sciences, Penn State College of Medicine, Hershey, Pennsylvania.
6. Pennsylvania Department of Health, Harrisburg.