Development of a Quality of Life Measurement Scale in Hereditary Haemorrhagic Telangiectasia (HHT) Disease.

"Patients will be asked to complete questionnaires.~Group 1: the purpose is to simplify a 75 items scale by a statistical analysis of the data collected from 400 patients. The statistical purification will allow to finalize an abbreviated scale (20-25 items).~Doctors specialized in Hereditary Haemorrhagic Telangiectasia may suggest that patients enter the study. After submission of the information notice and collection of their non-opposition, patients will have the choice to fill out the paper version or the electronic version of the scale and questionnaires."

"Patients will be asked to complete questionnaires.~Group 2: the purpose is to validate the abbreviated scale by a statistical analysis of the data collected from 200 patients. The statistical validation will allow to check the consistency and correlation of the abbreviated scale with other scales: a general Quality Of Life scale (SF36), an anxiety and depression scale (HAD), a social support scale (SSQ6) and a scale of regulation emotional (CERQ) and to test and re-test to check fidelity of the abbreviated scale.~Doctors specialized in Hereditary Haemorrhagic Telangiectasia may suggest that patients enter the study. After submission of the information notice and collection of their non-opposition, patients will have the choice to fill out the paper version or the electronic version of the scale and questionnaires."