Smoking

• Durham VA Medical Center, Durham, NC — Durham, North Carolina, United States

Not specified

• Gaziosmanpasa University Faculty of Dentistry — Tokat Province, Turkey (Türkiye)

• Mayo Clinic — Phoenix, Arizona, United States
• University of California San Francisco — San Francisco, California, United States
• Moffitt Cancer Center — Tampa, Florida, United States
• Johns Hopkins University — Baltimore, Maryland, United States

• Group Health Cooperative — Seattle, Washington, United States

• University College Dublin — Dublin, Leinster, Ireland

• Penn State Hershey — Hershey, Pennsylvania, United States

• Medical University of South Carolina — Charleston, South Carolina, United States

• University of Pennsylvania — Philadelphia, Pennsylvania, United States

• Cooper Family Medicine — Camden, New Jersey, United States