McBride CM, Curry SJ, Grothaus LC, Rosner D, Louie D, Wagner EH. Use of self-help materials and smoking cessation among proactively recruited and volunteer intervention participants. Am J Health Promot. 1998 May-Jun;12(5):321-4.
McBride CM, Curry SJ, Grothaus LC, Rosner D, Louie D, Wagner EH. Use of self-help materials and smoking cessation among proactively recruited and volunteer intervention participants. Am J Health Promot. 1998 May-Jun;12(5):321-4.