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Dr. John F. Sarwark is Head , Orthopaedic Surgery ; Martha Washington Foundation for Handicapped Children Professor in Pediatric Orthopedics at Children 's Memorial Hospital ; Professor of Orthopaedic Surgery , Northwestern University 's Feinberg School of Medicine in Chicago , Illinois .
 Sarwark, Orthopaedic, Children, Children 's Memorial Hospital, Orthopaedic, Northwestern University, Feinberg School of Medicine, Chicago, Illinois
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sarwark, Orthopaedic, Children, Children 's Memorial Hospital, Orthopaedic, Northwestern University, Feinberg School of Medicine, Chicago, Illinois