Overview
Patients, parents of young / handicapped patients, and experts will be interviewed to collect contents relevant for HrQoL in CBS deficiency. Based on these data, a questionnaire will be developed and tested for comprehensibility in patients and parents of young / handicapped patients. A final questionnaire version will be tested for psychometric criteria including validity and reliability.
Eligibility
Inclusion criteria
- Patients with CBS deficiency from age 8 years
- Parents of patient(s) < 18 years with cognitive impairment
- Parents of patients between age 4 and 7
- Experts on CBS deficiency
- Able to give informed consent as documented by signature
Exclusion criteria
- Sufficient command of the German or the English language