[1] Campus Antwerp Univ Hosp UZA, Univ Psychiat Dept, Antwerp, Edegem, Belgium
[2] UA, CAPRI, Fac Med & Hlth Sci, Antwerp, Belgium
[3] Antwerp Univ Hosp UZA, Behav Therapy Div Fatigue & Funct Symptoms, Antwerp, Edegem, Belgium
[4] Antwerp Univ Hosp UZA, Dept Internal Med, Antwerp, Edegem, Belgium
[5] Campus Psychiat Hosp St Norbertus, Univ Psychiat Dept, Duffel, Belgium