The incidence of adverse events in Swedish hospitals: a retrospective medical record review study.
Soop M, Fryksmark U, Köster M, et al. The incidence of adverse events in Swedish hospitals: a retrospective medical record review study. Int J Qual Health Care. 2009;21(4):285-91. doi:10.1093/intqhc/mzp025.
Approximately 1 in 12 hospitalized patients in Sweden experienced a preventable adverse event, according to this retrospective study that used the same methodology as the Harvard Medical Practice Study.

