Matsuki, Yuka, Ko Takakura, and Kenji Shigemi. 2019. “General Anesthesia and Intraoperative Opioids Do Not Affect Postoperative Delirium in Femoral Neck Surgery”. Anaesthesia, Pain & Intensive Care, January, 372-75. https://apicareonline.com/index.php/APIC/article/view/345.