Osteoarthritis, Knee

• Arizona Arthritis & Rheumatology Research, PLLC — Mesa, Arizona, United States
• Arizona Research Center — Phoenix, Arizona, United States
• Tucson Orthopaedic Research Center — Tucson, Arizona, United States
• Baptist Health Center for Clinical Research — Little Rock, Arkansas, United States

• Railway General Hospital — Rawalpindi, Punjab Province, Pakistan

• Qianfoshan Hospital — Jinan, Shandong, China

• China Medical University — Taichung, Taiwan

• The Royal Orthopaedic Hospital — Birmingham, United Kingdom
• Chapel Allerton Hospital — Leeds, United Kingdom
• Pilgrim Hospital, United Lincolnshire Hospitals NHS Trust — Lincoln, United Kingdom
• The Whittington Hospital — London, United Kingdom

• Missouri Orthopaedic Institute — Columbia, Missouri, United States

Not specified

• Taipei Veterans General Hospital — Taipei, Taiwan

• Pontificia Universidad Católica de Chile — Santiago, Santiago Metropolitan, Chile

• the Third Hospital of Hebei Medical University — Shijiazhuang, Hebei, China