1 Internal Medicine Department, Hospital Universitario Ramón y Cajal, Madrid. Electronic address: paullacer@hotmail.com.
2 Internal Medicine Department, Hospital Universitario Ramón y Cajal, Madrid; Department of Medicine and Medical Specialties, Facultad de Medicina y Ciencias de la Salud, Universidad de Alcalá, IRYCIS, Madrid, Spain.
3 Internal Medicine Department, Hospital Universitario Ramón y Cajal, Madrid.
4 Internal Medicine Department, Hospital de Manises, Valencia, Spain.