Inclusion criteria |
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   (1) The participant has given written informed consent |
   (2) CFS diagnosis according to the CDC criteria [1] |
   (3) Adolescent between 12-18 years old at inclusion |
   (4) Fatigue severity subscale (CIS-20) score ≥40 (healthy population's mean plus two SD) [19] |
   (5) Physical functioning (Child Health Questionnaire) score <85 (healthy population's mean minus two SD) and/or school participation ≤85% (healthy population's mean minus two SD) in last two weeks [20] |
Exclusion criteria |
   (1) Inadequate control of Dutch language by child or parent |
   (2) No availability of computer hardware and internet connection |
   (3) Suicide risk as assessed on the Children's Depression Inventory (CDI) [21] |
   (4) Cognitive retardation (when indicated an IQ-test will be conducted; IQ <85 will be excluded) |
   (5) Score greater than or equal to 44 (healthy population's mean plus two SD) on the State-Trait Anxiety Inventory for Children (STAIC) [23] |
   (6) Score greater than or equal to 16 (healthy population's mean minus two SD) on the Children's Depression Inventory (CDI) [21] |