Vlaeyen, Johan W.S.∗,a,b; Kole-Snijders, Ank M.J.a,c; Boeren, Ruben G.B.a; van Eek, H.c
aInstitute for Rehabilitation Research, 6432 CC Hoensbroek, The Netherlands
bDepartment of Medical Psychology, University of Limburg, 6200 MD Maastricht, The Netherlands
cLucas Foundation For Rehabilitation, 6432 CC Hoensbroek, The Netherlands
∗Corresponding author: Johan W.S. Vlaeyen, Institute for Rehabilitation Research, Zandbergsweg 111, 6432 CC Hoensbroek, The Netherlands.
Submitted April 29, 1994; revised December 15, 1994; accepted December 16, 1994.