Steel K, Gertman PM, Crescenzi C, Anderson J (1981). „Iatrogenic illness on a general medical service at a university hospital”. New England Journal of Medicine. 304 (11): 638—42. PMID7453741. doi:10.1056/NEJM198103123041104.
Steel K, Gertman PM, Crescenzi C, Anderson J (1981). „Iatrogenic illness on a general medical service at a university hospital”. New England Journal of Medicine. 304 (11): 638—42. PMID7453741. doi:10.1056/NEJM198103123041104.