1. Department of Immunology, Ophthalmology and ENT Facultad de Medicina Universidad Complutense de Madrid (UCM) Madrid Spain
2. Hospital Universitario Príncipe de Asturias Madrid Spain
3. Department of Statistics and Operations Research Facultad de Medicina Universidad Complutense de Madrid (UCM) Madrid Spain
4. Instituto de Investigación Sanitaria Gregorio Marañón (IiSGM) Madrid Spain