Bastian LA, Driscoll M, DeRycke E, Edmond S, Mattocks K, Goulet J, Kerns RD, Lawless M, Quon C, Selander K, Snow J, Casares J, Lee M, Brandt C, Ditre J, Becker W. Pain and smoking study (PASS): A comparative effectiveness trial of smoking cessation counseling for veterans with chronic pain. Contemp Clin Trials Commun. 2021 Sep; 23:100839.