Protocol for an economic analysis of the randomised controlled trial of Improving the Well-being of people with Opioid Treated CHronic pain: I-WOTCH Study oleh Kirstie Haywood, Anisur Rahman, Kate Seers, Dipesh Mistry, Charles Abraham, Sharisse Alleyne, Shyam Balasubramanian, Lauren Betteley, Katie Booth, Dawn Carnes, Ranjit Lall, Andrea Manca, Jennifer Noyes, Jane Shaw, Sam Eldabe, Andrea Dompieri Furlan, Sheeja Manchira Krishnan, Vijay Singh Gc, Cynthia P Iglesias Urrutia, Maddy Hill, Vivien Nichols, Nicole Tang, Emma Withers, Cynthia Urrutia