ER Extras are additional personnel that work in an Emergency Room. Interns are students who are in the process of completing their medical training and are supervised by a doctor or nurse. Nurses are healthcare professionals who provide care to patients and assist DOCTORS. DOCTORS are medical professionals who diagnose and treat illnesses and injuries. DRS and MDS are abbreviations for Doctor of Science and Medical Doctor respectively. RNS stands for Registered Nurse and EMTS stands for Emergency Medical Technicians, who provide pre-hospital care and transport patients to medical facilities.