Heapy AA, Driscoll MA, Buta E, LaChappelle KM, Edmond S, Krein SL, Piette JD, Mattocks K, Murphy JL, DeBar L, MacLean RR, Ankawi B, Kawecki T, Martino S, Wagner T, Higgins DM. Co-Operative Pain Education and Self-management (COPES) Expanding Treatment for Real-World Access (ExTRA): Pragmatic Trial Protocol. Pain Med. 2020 12 12; 21(12 Suppl 2):S21-S28.