Melatonin for prevention of postoperative delirium after lower limb fracture surgery in elderly patients (DELIRLESS): study protocol for a multicentre randomised controlled trial by Catherine Paugam-Burtz, Serge Molliex, Isabelle Durand-Zaleski, Emmanuel Weiss, Vincent Degos, Souhayl Dahmani, Marina Esposito-Farèse, Agathe Raynaud-Simon, Stéphanie Sigaut, Camille Couffignal, Jacques Boddaert, Estelle Marcault, Madalina Jacota

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