Precancerous Conditions

• Cross Cancer Institute — Edmonton, Alberta, Canada
• Newfoundland Cancer Treatment and Research Foundation — St. John's, Newfoundland and Labrador, Canada
• Princess Margaret Hospital — Toronto, Ontario, Canada
• McGill University — Montreal, Quebec, Canada

• University college london hospitals — London, United Kingdom

• UCSF Helen Diller Family Comprehensive Cancer Center — San Francisco, California, United States
• University of Chicago Cancer Research Center — Chicago, Illinois, United States
• Lucille P. Markey Cancer Center at University of Kentucky — Lexington, Kentucky, United States
• Greenebaum Cancer Center at University of Maryland Medical Center — Baltimore, Maryland, United States

• Arizona Cancer Center — Tucson, Arizona, United States

• Brookdale Hospital and Medical Center — Brooklyn, New York, United States
• Texas Tech Health Sciences Center — El Paso, Texas, United States
• Vancouver General Hospital - Women's Clinic (G&L Diamond Centre) — Vancouver, British Columbia, Canada

• Abramson Cancer Center of the University of Pennsylvania — Philadelphia, Pennsylvania, United States

• Proyecto Epidemiologico Guanacaste — Liberia, Costa Rica

• Case Medical Center, University Hospitals Seidman Cancer Center, Case Comprehensive Cancer Center — Cleveland, Ohio, United States

Not specified

• Cleveland Clinic Taussig Cancer Center — Cleveland, Ohio, United States
• M. D. Anderson Cancer Center at University of Texas — Houston, Texas, United States
• Texas Children's Hospital — Houston, Texas, United States
• University of Texas Medical School at Houston — Houston, Texas, United States