1. Department of Medicine and Surgery, Public Health, Psychology and Immunology and Medical Microbiology, Odontology and Nursing, Universidad Rey Juan Carlos, Alcorcón, Madrid, Spain.
2. Critical Care Unit, Hospital Universitario Fundación Alcorcón, Alcorcón, Madrid, Spain.
3. Obstetrics Department, Hospital Universitario de Fuenlabrada, Fuenlabrada, Madrid, Spain.