1 Department of Internal Medicine, La Paz University Hospital, Paseo Castellana 261, Madrid 28046, Spain. Electronic address: alejandro.diez@salud.madrid.org.
2 Department of Emergency Medicine, La Paz University Hospital, Paseo Castellana 261, Madrid 28046, Spain.
3 Department of Internal Medicine, La Paz University Hospital, Paseo Castellana 261, Madrid 28046, Spain; Department of Medicine, Universidad Alfonso X El Sabio, Avenida Universidad 1, Villanueva de la Cañada, Madrid 28691, Spain.