1. Thromboembolism Unit, Internal Medicine Department, Hospital Universitario Infanta Leonor-Virgen de la Torre, Madrid, Spain
2. Thromboembolism Unit, Internal Medicine Department, Hospital Universitario de Fuenlabrada, Madrid, Spain
3. Medicine Department, Complutense University, Madrid, Spain
4. Internal Medicine Department, Hospital Universitario de Fuenlabrada, Madrid, Spain
5. CIBERINFEC, Madrid, Spain