Psychometric Properties of a Lymphedema-specific Quality of Life Questionnaire in Lower Limb Lymphedema

Inclusion Criteria: * Primary or secondary lymphedema at the lower limb(s), i.e. a difference of ≥5% in volume between the two sides or a lymphoscintigraphy which shows at least 2 minor criteria or 1 major criterion or presence of indocyanine green (ICG) dermal backflow * Unilateral/bilateral lymphedema * Lymphedema stage 1, 2a, 2b or 3 * Lymphedema is present \>3 months * Chemotherapy and radiotherapy was finished \>3 months ago * Native French-speaking or Dutch-speaking for study about the French or Dutch Lymph-ICF-LL, respectively * During the study patients are in the maintenance phase and not in the intensive phase (for the reliability/validity/responsiveness); patients receive intensive treatment in the hospital (for the responsiveness) * Given informed consent to participate * \>18 years old Exclusion Criteria: * Not able to read or fully understand the French or Dutch language for study about the French or Dutch Lymph-ICF-LL, respectively * For the reliability and validity and for part of the responsiveness: first treatment for lymphedema \< 6 months ago and an intensive phase is planned or needed according to a specialized caregiver in treating lymphedema * \<18 years old * Pregnant or breastfeeding women