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Perioperative patient outcomes in the African Surgical Outcomes Study: a 7-day prospective observational cohort study.

Kenneth R. Bischof, M. Kumar, A. Omigbodun, 2018, Lancet.

South African Paediatric Surgical Outcomes Study: a 14‐day prospective, observational cohort study of paediatric surgical patients

P. Jeena, B. Mrara, B. Ravid, 2019, British journal of anaesthesia.