Chronic Rhinosinusitis (CRS) With and Without Nasal Polyps

• Excel ENT — Birmingham, Alabama, United States
• SENTA Clinica — San Diego, California, United States
• Colorado ENT & Allergy — Colorado Springs, Colorado, United States
• Physicians' Clinic of Iowa — Cedar Rapids, Iowa, United States

• UCLA Santa Monica Medical Center — Santa Monica, California, United States
• Northwestern University Feinberg School of Medicine — Chicago, Illinois, United States
• Brigham Sinus Center at Brigham and Women's Hospital — Boston, Massachusetts, United States
• Thomas Jefferson University Hospital — Philadelphia, Pennsylvania, United States

• Colorado ENT & Allergy — Colorado Springs, Colorado, United States
• Emory University — Atlanta, Georgia, United States
• University of Illinois at Chicago — Chicago, Illinois, United States
• Louisiana State University Health at Shreveport — Shreveport, Louisiana, United States

Not specified

• Fondazione Policlinico Universitario A. Gemelli IRCCS — Roma, Italy

• San Diego Clinical Research Center — La Mesa, California, United States
• Velocity Clinical San Diego — La Mesa, California, United States
• National Research Institute — Panorama City, California, United States
• Sacramento Ear Nose and Throat Surgical and Medical Group, Inc. — Roseville, California, United States

• Nanjing First Hospital — Nanjing, Jiangsu, China