Study conducted at the Shriners Hospitals for Crippled Children, Philadelphia Unit, Philadelphia, Pennsylvania, U.S.A.
From the Shriners Hospital for Crippled Children, Philadelphia, Pennsylvania, U.S.A.
Address correspondence and reprint requests to Dr. H. H. Steel, Shriners Hospitals for Crippled Children, Philadelphia Unit, 8400 Roosevelt Blvd., Philadelphia, PA 19152, U.S.A.