Lisenda, Laughter2015-05-052015-05-052015-05-05http://hdl.handle.net/10539/17620Thesis (M.Med.(Orthopaedic Surgery))--University of the Witwatersrand, Faculty of Health Sciences, 2013.enMedical Errors--prevention & controlThe effects of a surgical safety checklist on mortality, morbidity and cancellationThesis