A Study of the Epidemiology and Hospital Management of Patients With PROS in France

Inclusion criteria: Population P1 was identified using a combined query, considering: * International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM) codes for PROS-related malformations; OR * PROS-related technical procedures performed during hospitalizations to relieve the symptoms of the disease. Subpopulation SP1 was identified through the identification of at least two PROS-related hospitalizations (PROS-related ICD-10-CM or technical procedure code), including the index hospitalization. Exclusion criteria: Presence at any time during the entire study period of: * ICD-10-CM codes for chromosomal malformation; OR * ICD-10-CM code for hemangioma to avoid inclusion of patients with hemangioma and other vascular malformation; OR * ICD-10-CM codes associated with the following comorbidities: cancer, cerebrovascular pathologies, hemiplegia (for pediatric patients only), metastatic pathologies, or myocardial infarction.