1. School of Public Health Oregon Health & Science University Portland Oregon USA
2. Acute Communicable Disease Control Program Los Angeles County Department of Public Health Los Angeles California USA
3. Department of Epidemiology and Biostatistics, School of Public Health University at Albany Rensselaer New York USA
4. Division of Viral Hepatitis National Center for HIV, Viral Hepatitis, STD, and TB Prevention, CDC Atlanta Georgia USA
5. New York State Department of Health Albany New York USA