A National Dental Practice-Based Research Network phase II, cluster-randomized clinical trial assessing nicotine replacement therapy sampling in dental settings: study protocol for... by Pearl Fang, Melissa Adkins-Hempel, Tamara Lischka, Sarah Basile, D. Brad Rindal, Matthew J. Carpenter, Dorota T. Kopycka-Kedzierawski, Jennifer Dahne, Sarah A. Helseth, Douglas E. Levy, Arthur Truong, Michael C. Leo, Kimberly Funkhouser, David R. Louis, Sandra J. Japuntich, The National Dental PBRN Collaborative group

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