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Global variation in postoperative mortality and complications after cancer surgery: a multicentre, prospective cohort study in 82 countries

Ramadan M. Hamed, Tsz Lun Ernest Wong, Amr H. Ali, 2021, The Lancet.

Impact of opioid-free analgesia on pain severity and patient satisfaction after discharge from surgery: multispecialty, prospective cohort study in 25 countries

Ahmed M. Elkhodary, A. A. Ajulo, John van Bockxmeer, 2024, The British journal of surgery.