Neuralgia, Postherpetic

• Sydney, New South Wales, Australia

• Faculty of Medicine — Tanta, Algharbia, Egypt
• Faculty of Medicine — Al Fayyum, Egypt
• Tanta University hospitals — Tanta, Egypt

• Inner Mongolia Baogang Hospital — Baotou, Inner Mongolia, China

• Seoul National University Hospital — Seoul, South Korea

• Nucleus Network — Melbourne, Victoria, Australia

Not specified

• Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology — Wuhan, Hubei, China
• Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology — Wuhan, China

• Beijing Tiantan Hospital — Beijing, Beijing Municipality, China

• PARC Clinical Research, Royal Adelaide Hospital — Adelaide, Australia
• PARATUS Clinical Research Brisbane — Brisbane, Australia
• PARATUS Clinical Research Canberra — Canberra, Australia
• Genesis Research Services — Sydney, Australia

• Birmingham, Alabama, United States
• Phoenix, Arizona, United States
• Plantation, Florida, United States
• Marietta, Georgia, United States