title: Statistical Commentary.
authors.affiliation: Department of Surgery, Division of Public Health Science, Washington University School of Medicine, 660 S Euclid Ave, St. Louis, MO 63108. Electronic address: colditzg@wustl.edu.
authors.forename: Graham A
authors.initials: GA
authors.lastname: Colditz
mesh_terms: D006349:Heart Valve Diseases / Q000601:surgery*; D019918:Heart Valve Prosthesis Implantation / Q000379:methods*; D006801:Humans; D019060:Minimally Invasive Surgical Procedures / Q000379:methods*; D008943:Mitral Valve / Q000601:surgery*; D064887:Observational Studies as Topic; D011183:Postoperative Complications / Q000453:epidemiology*; D018570:Risk Assessment