The Concept of Fatigue or Tiredness as Experienced in Health and Disease, and More Specifically in Cancer -- A Qualitative Study to Explore the Concept of Fatigue/Tiredness in Cancer Patients and in Healthy Individuals -- Construction of a New Fatigue Assessment Questionnaire -- Testing the Fatigue Assessment Questionnaire in Healthy Persons and in Cancer Patients -- The Relationship Between Fatigue and Type and Stage of Cancer
