Employment of Patients With Pseudoxanthoma Elasticum

"Eligible subjects will be pre-selected by the study investigators on the basis of the medical file. A letter of information about the study will be sent to all the pre-selected eligible patients, with the exception of patients who have expressed an objection to the processing of their data for research purposes during their treatment.~The investigators will contact eligible patients by telephone approximately 2 weeks after the mailing of the information letter. During this telephone call, the investigator will answer any questions the patient may have about the study and will collect the patient's non-objection to participate in the study and their responses to the questionnaire."