From the Spaarne Gasthuis Academy, Spaarne Gasthuis Hospital, Hoofddorp (EW, KJvS), Department of Clinical Epidemiology, Biostatistics and Bioinformatics, Academic Medical Center, University of Amsterdam, Amsterdam (SIBP) and Department of Anesthesiology, Spaarne Gasthuis Hospital, Hoofddorp, The Netherlands (RDHdB).