1. Division of Field Studies and Engineering, National Institute for Occupational Safety and Health Centers for Disease Control and Prevention Cincinnati Ohio USA
2. Division of Coronaviruses and Other Respiratory Viruses, National Center for Immunizations and Respiratory Disease Centers for Disease Control and Prevention Atlanta Georgia USA
3. Office of the Director, National Institute for Occupational Safety and Health Centers for Disease Control and Prevention Cincinnati Ohio USA
4. American Red Cross Scientific Affairs, Dedham, MA Rockville Maryland USA