Pain, Postoperative

• Clinical Research Associates, Inc. — Birmingham, Alabama, United States
• Shoals Medical Trials, Inc. — Sheffield, Alabama, United States
• University of California, Irvine — Orange, California, United States
• Vision Clinical Research — Wellington, Florida, United States

• Maasstad Hospital — Rotterdam, Netherlands

• Washington University School of Medicine — St Louis, Missouri, United States

• Brain Stimulation Laboratory, Institute of Psychiatry — Charleston, South Carolina, United States

• Maimonides Medical Center — Brooklyn, New York, United States

• Maimonides Medical Center — Brooklyn, New York, United States

• Kahramanmaras Sutcu Imam University Hospital — Kahramanmaraş, Turkey (Türkiye)

• University of Rochester Medical Center — Rochester, New York, United States

Not specified

• Endodontic Department - Faculty of Oral and Dental Medicine - Cairo University — Cairo, Egypt