Affiliation: | 1.Department of Surgery, VU University Medical Center, De Boelelaan 1117, P.O. Box 7057, 1081, HV Amsterdam, The Netherlands ;2.Department of Surgery, MC Slotervaart, Louwesweg 6, 1066, EC Amsterdam, The Netherlands ;3.Department of Epidemiology and Biostatistics, VU University Medical Center, De Boelelaan 1117, 1081, HV Amsterdam, The Netherlands ; |