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Charles A. Popkin, MD, specializes in arthroscopic and open treatment of the knee, shoulder, elbow, ankle, hip and general pediatric orthopedics and fracture care. Dr. Popkin is also an assistant professor of orthopedic surgery at Columbia University Medical Center and…

During the Women's World Cup semifinal between the United States and Germany, a head collision between Morgan Brian and Alexandra Popp revealed deficient FIFA procedures when dealing with threats of concussions, according to The New York Times.

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