1. Association of Schools and Programs of Public Health (ASPPH)/Centers for Disease Control and Prevention (CDC) Public Health Fellowship Program, Washington, DC, USA
2. Respiratory Health Division, National Institute for Occupational Safety and Health (NIOSH), CDC, Morgantown, WV, USA
3. Division of Surveillance, Hazard Evaluations and Field Studies (DSHEFS), NIOSH, CDC, Cincinnati, OH, USA