[1] Amsterdam Rehabil Res Ctr, Reade, Netherlands
[2] Vrije Univ Amsterdam Med Ctr, EMGO Inst, Rehabil Med, Amsterdam, Netherlands
[3] Jan van Breemen Res Inst, Reade, Netherlands
[4] Slotervaart Hosp, Orthoped, Amsterdam, Netherlands
[5] Westfriesgasthuis, Rheumatol, Hoorn, Netherlands
[6] Vrije Univ Amsterdam Med Ctr, Psychiat, Amsterdam, Netherlands
[7] Vrije Univ Amsterdam Med Ctr, Rheumatol, Amsterdam, Netherlands