A recent study revealed that the percentage of people treated at large, urban hospitals who recover from their illnesses is lower than the percentage for people treated at smaller, rural hospitals. Each of the following, if true, contributes to an explanation of the difference in recovery rates EXCEPT: ['Because space is relatively scarce in large hospitals, doctors are encouraged to minimize the length of time that patients are held for observation following a medical procedure.', 'The less friendly, more impersonal atmosphere of large hospitals can be a source of stress for patients at those hospitals.', "Although large hospitals tend to draw doctors trained at the more prestigious schools, no correlation has been found between the prestige of a doctor's school and patients' recovery rate.", 'Doctors at large hospitals tend to have a greater number of patients and consequently less time to explain to staff and to patients how medications are to be administered.']