Online Courses Click on an online course's title below to preview the material, enroll, register, and more. Title Credits The Case for Immunizations 2.50 Where Medicine Meets Public Health: WIC 0.50 Radon Module #6: Predictors & Spatial Variation of Radon Testing in Illinois 0.75 Radon Module #2: Lung Cancer: Public Enemy #1 1.00 Tobacco Use Disorder: Online Module 0.50