Kalkman, J C.a,∗; Visser, Kb; Moen, Ja; Bonsel, J G.c; Grobbee, E D.d; Moons, M K.G.a,d
aDepartment of Anesthesiology, Division of Perioperative Care and Emergency Medicine, University Medical Center Utrecht, P.O. Box 85500, 3508 GA Utrecht, The Netherlands
bDepartment of Anesthesiology, Academic Medical Center, Amsterdam, The Netherlands
cDepartment of Public Health, Academic Medical Center, Amsterdam, The Netherlands
dJulius Center for Health Sciences and Primary Care, University Medical Center Utrecht, The Netherlands
∗Corresponding author. Tel.: +31–30–2509677; fax: +31–30–2541828
E-mail: [email protected]
Submitted December 3, 2002; revised April 25, 2003; accepted June 2, 2003.