Opioid analgesia for acute low back pain and neck pain (the OPAL trial): a randomised placebo-controlled trial

Caitlin Jones, Richard O. Day, Bart W. Koes, Jane Latimer, Christopher G. Maher, Andrew J. McLachlan, Laurent Billot, Sana Shan, Chung‐Wei Christine Lin, Hanan McLachlan, Melissa Webb, Melanie Hamilton, Harbeer Ahedi, Angie Barber, Wendy Mak, Stephanie Mathieson, Veronika Petrova, Séverine Bompoint, Sana Shan, Bridin Murnion, Nicholas A. Buckley, Apo Demirkol, Paul J. Wrigley, Christopher Needs, Louise Brooks, Samuel Cantori, Paul Preisz, James Aitken, Sujata Allan, Michael Burke, Greg Cameron, Francisco Javier Valencia Cepeda, Christopher Davis, Jayasree Dullur, Joseph Emmanuel, Catherine Errey, Sabine Fieuw‐Makaroff, Adam Gaudry, Lucia Genua, I. C. Longhurst, Kenneth McCroary, Diana Merhi, Tanya T. Nguyen, Zahra Rassoly Obayd, Michelle Penm, Sharan Pobbathi, William S Poh, Paul Schnitzler, Sabiha Shahnaz, Ven Tan, Danny Tang, Brian Tan, Win Kyaw Thu, Thrasivolous Triantopolous, R Venkatesan, Wicky Chun Fai Wong, Shu Yang