Safe Surgery Saves Lives Study G. A surgical safety checklist to reduce morbidity and mortality in a global population - Haynes, A B; Weiser, T G; Berry, W R; Lipsitz, S R; Breizat, A H; Dellinger, E P; Herbosa, T; Joseph, S; Kibatala, P L; Lapitan, M C; Merry, A F; Moorthy, K; Reznick, R K; Taylor, B; Gawande, A A (N Engl J Med, 2009)