Opioid PrEscRiptions and usage After Surgery (OPERAS): protocol for a prospective multicentre observational cohort study of opioid use after surgery by David Watson, Milos Buhavac, Arnab Banerjee, Jennifer Martin, Melissa Park, Orestis Ioannidis, Ademola Adeyeye, Chris Varghese, Toby Richards, Muhammed Elhadi, Deborah Wright, Peter Pockney, Davina Daudu, Nicholas Lightfoot, Aya Basam, Liam Ferguson, Lorane Gaborit, Sarah Goh, Amie Hilder, Aiden Jabur, Kaviya Kalyanasundaram, Chui Foong Ong, Upasana Pathak, Kyle Raubenheimer, Venesa Siribaddana, Jennifer Vu, Cameron Wells, William Xu, Luis Adrian Alvarez-Lozada, Simran Vinod Benyani, Giacomo Calini, Semra Demirli Atici, Mustafa Deniz Tepe, Nandini Karthikeyan, Laure Taher Mansour, Upanmanyu Nath, Warren Seow, Surya Singh, Zoya Tasi, Ahmad Uzair, Wah Yang, Faseeh Zaidi, Kristy Atherton, Amanda Dawson, Nagendra Dudi-Venkata, Isabella Ludbrook, Luke Peters, Rachel Sara

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