[1] Erasmus Univ, Med Ctr, Dept Orthopaed, NL-3000 CA Rotterdam, Netherlands
[2] Erasmus Univ, Med Ctr, Dept Psychiat, Sect Med Psychol & Psychotherapy, NL-3000 CA Rotterdam, Netherlands
[3] Elisabeth Hosp, Dept Orthopaed, Tilburg, Netherlands
[4] Reinier Graaf Hosp, Dept Orthopaed, Delft, Netherlands
[5] Erasmus Univ, Med Ctr, Dept Gen Practice, NL-3000 CA Rotterdam, Netherlands