Dr. Nan Liu is a Chief Physician and Associate Professor at the Department of Rehabilitation Medicine, Peking University Third Hospital (PUTH), where he serves as Deputy Director of both the Department and the Osteoporosis and Bone Metabolism Center. His clinical expertise focuses on spinal cord injury rehabilitation, non-surgical management of spinal and extremity joint disorders, osteoporosis, and post-operative rehabilitation for orthopedic and sports injuries. Dr. Liu holds key international roles, including member of the WHO Guideline Development Group for spinal cord injury rehabilitation, Collaborating Researcher at ICORD (University of British Columbia), and Visiting Assistant Professor at UBC. He serves on the editorial board of Spinal Cord and has published over 18 peer-reviewed papers, including 15 SCI-indexed articles, while leading multiple National Natural Science Foundation projects.