In Andalusia, hospitals are stratified into 4 categories according to service area and number of medical and surgical specialties [6]: (1) regional university hospitals (referral hospital in the whole autonomous community with all specialties available); (2) specialized university hospitals (referral hospital in a province and with wide number of specialties available); (3) basic general hospitals (referral hospital in a region and with all basic specialties available); (4) highly-specialized hospitals (referral hospital in a local area and with all basic specialties available).