Selection Bias, Orthopaedic Style: Knowing What We Don't Know About Aspirin

Affiliations

• ¹ Department of Orthopaedics, Dartmouth-Hitchcock Medical Center and Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire.
• ² Division of Hematology and Thromboembolism, Department of Medicine, McMaster University, Hamilton, Ontario, Canada.
• ³ Department of Orthopaedics, Penn State Hershey Medical Center, Hershey, Pennsylvania.
• ⁴ Department of Medical Social Sciences, Northwestern University Feinberg School of Medicine, Chicago, Illinois.
• ⁵ Section of Vascular Medicine, Department of Medicine (S.Z.G.), and Department of Orthopaedic Surgery (R.I.), Harvard Medical School, Brigham and Women's Hospital, Boston, Massachusetts.
• ⁶ Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, Maryland.